group ( say sub-grid, row, or column). with ease. Sudoku puzzle solutions (or game combinations) possible. Colour Sudoku is the puzzle as normal Sudoku with an extra constraint. Consequently one branch is assigned x and the other y, leaving the root without a. n the diagram we have labeled cell A (root cell) containing {2,5 ,8}. Jigsaw Sudoku) • and combinations thereof (e.g. Sudoku is a puzzle of numbers and numbers relate to mathematics, and the problems in mathematics have a unique solution. Extends the x-wing theory to include three cells as follows: Then any other cell which shares a group with both branch cells can exclude the z element that is common, Proof: If a root cell sharing a group with both branch cells has member 'z', then neither branch can be, assigned 'z'. 2012 PUZZLE-ON-LINE-NICHE.COM @All Rights Reserved. Compatible with all browsers, tablets and phones including iPhone, iPad and Android. We proceed around the grid in a like manner. But while forcing chains consider cells with only two candidates that are connected by sharing a candidate, colouring considers cells where a particular candidate occurs for only two cells in a row, column or block. If a single cell now sees a complete set of lightly shaded cells in a unit, it can only be true if the terminal cell is true, and is given the same color (a bonus cell). First a1 & a2 are lightly shaded in green, as one of them must be true if X is false. For our purposes. The logic continues: A -> (b1 & b2) -> B -> (c1 & c2) -> C. From the green cell, Y, we also get Y -> d1 -> D, but note d1 cannot be strongly coloured even though it is conjugate with D, as although D must be true when Y is true, it may still be true even when Y is false. Wing X for Saturday, November 26 – this is the only plac… Like us on Facebook Follow us on Twitter Follow us on Instagram. Sudoku 2Go with 10'000 puzzles, 10 different variants, 5 levels of difficulty and a world-class hint engine. Of course it may be easier to visualize, refer to the diagram below: In the diagram we have labeled cell A (root cell) containing {2,5 ,8}. The algorithm is repeated until the allowed value in the 81st cell is discovered. This is the Sudoku solving guide, teaching you a wide range of Sudoku solving techniques with practical examples and illustrations. given row, column, or sub-grid.) Jul 23, 2020 - Instead, a very similar yet different variation – the true Wing X. (Those highlighted in red). nine's must be false and we can now safely add the green colored nines. Consider the following Sudoku puzzle: In this example we have highlighted all the possible values for our candidate (the number 6). Introduce sudoku solving technique : A Color Wing is a subtype of coloring that eliminates candidates using multiple clusters. the color must be the 'false' color, since this is impossible, or an illegal state. An uncolored cell that sees cells of opposite colors (Color Trap): Since the cells with the same color are either all true or all false, one of the two colored cells has to be true, and the uncolored cell can never have the color candidate placed. Other candidate 5's in these three columns (highlighted yellow) can be excluded safely.Note: As shown in this example, there does not have to be exactly 3 cells in each row (or column), there may be less. These Sudoku solutions techniques are for the serious Sudoku addict! Color Sudoku Puzzle Welcome to our colour Sudoku. Play Social media. If you have a bunch of odds and ends and throw away all but one, what do you have left? Four levels from Easy to Evil. The eliminations take place outside these clusters. In addition to the standard Sudoku puzzles it offers these Sudoku variants: • X-Sudoku • Hyper-Sudoku • Percent-Sudoku • Color-Sudoku • Squiggly Sudoku (a.k.a. Note: Whenever two cells within a group ( sub-grid, row or column), have the same color, this would indicate. Each colour is in the same position in each 3x3 box, as you will notice with the central white cell, for example. What was the best thing 'before' sliced bread? The difference is that this method is non-bifurcative, as only one un-branched chain is involved at any time. Why is the person who invests your money called a broker? You've probably heard of Sudoku, the popular Japanese game of numbers in boxes that became a worldwide sensation, appearing in newspapers all over the world. If a single cell now sees a complete set of lightly shaded cells in a unit, it can only be true if the terminal cell is true, and is given the same color (a bonus cell). The value in that cell is then incremented by one. Multi-Colouring Type 1 eg 1 : Load Example or : From the Start In this Sudoku we've looking at number 7 and labelled two chains A and B and settled on the plus and minus symbols. Play 16 Jan 2021. (The converse of this theory also holds, that is interchange the words row and column above), Candidate y must be assigned once in each row. If you're here, you're probably familiar with the rules of Sudoku: fill in the empty cells in the grid with the numbers 1 through 9 so that no row, column, or 3x3 box has two copies of some number. If you have a bunch of odds and ends and throw away all but. All the Sudoku you'll ever need! left corner and top right corner, which form an X, hence x-wing. When checking for violations, it is discovered that the "1" is not allowed, so the value is, advanced to a "2". (The converse of this theory also holds, that is interchange the words row and column above). Play 17 Jan 2021. Beyond this simple description lies a wide variety of complex tactics that are used to … These are very involved tactics and require extensive knowledge of Sudoku puzzle strategy., they are slightly different from strategies such as elimination, CRME, lone rangers, etc, in that they, do not follow the standard sub-grid, row, column recognition patterns involved with the afore-, To solve Sudoku puzzles using this process, one must have recognition of number relationships, in the grid. Similar to an x-wing pattern, the swordfish theory proceeds as follows:. Again, here is the graphic example: In this example we have highlighted all the possible values for our candidate (the number 5). You can use Y-Wing if each of the two candidates in the pivot forms a conjugate pair in two different units. SudoCue - Sudoku Solving Guide Last update: January 7, 2007 (Thanks to VK for spotting an incorrect puzzle string for the hidden triple example). The other strategies of bifurcation are XY wing and color wing which are very similar. The Company. What is Sudoku Puzzle? puzzle solutions (or game combinations) possible. Play 15 Jan 2021. X-Wing. The cells seen by the end of the starting chain are all lightly shaded in the opposite colour. and moves back to the previous cell. Sudoku Solving Techniques Coloring. Basically it is a numbers crunching game, A brute force algorithm visits the empty cells in some order, filling in digits sequentially from the, available choices, or backtracking (removing failed choices) when stymied. However, there must not be more that three candidates in the pattern defining rows. From Advanced Sudoku Solutions to Sudoku Puzzle, From Advanced Sudoku Solutions to Puzzle Games Online. To solve Sudoku puzzles using this process, one must have, To begin with the name X- wing refers to the top right corner and bottom left corner, or the bottom. What will most likely happen is that you will be able to eliminate numbers from sibling cells which will then lead to finding final numbers using other techniques. So, if you are a complete beginner, here are a few Sudoku tips that you can use to improve your Sudoku skills. To avoid being bifurcative, each exclusion should reportable as a single unbranched chain of inferences (and so could be written as an AIC). There are two possible outcomes for the digit 7 … including simple Elimination, CRME, Twins, Triplets and Brute force. Read my article "Solve Sudoku" for a step by step description on how to reach the place where you apply this technique. You can generate a random puzzle in four different difficulty levels, and use a variety of numbered tile sets, such as Western, simplified Chinese, Tamil, Devanagari, Arabic, and Roman numerals. You can eliminate the digit 5 (marked in red) from the remaining cells of these rows. In the sudoku diagram below, in the first, fifth and eighth columns, the digit 5 can only be placed in the fifth, eighth and ninth rows (candidates marked in blue). assume a algorithm order of left to right, top to bottom. The 'Sudoku Solver With Colors' app is designed for both learning the basic rules for Sudoku as well as for solving puzzles, simply through the use of colors! Finally, as it was true for the x-wing, the converse is also true ( that is interchange the words, rows and columns) . The red square in the above image is the pivot. In the sudoku diagram below, the XY-Wing is formed by the R3C3 cell (pivot) and the R1C1 and R3C4 cells (pincers). Sudoku Swordfish is a variation of the X-Wing pattern. Again we provide a visual example to clarify the discussion. Therefore by the xy theory, we can safely eliminate 5 from those cells within the group contained by A,B, and C. ( This cell is highlighted in red ). If there is more than one possible single colouring chain, the method should be repeated for each one, when it produces nearly all the exclusions found by Multi-Colors. The same deductions available from Simple Colors are now available. The idea of the colors technique in essence then is to assign colors to. To solve Sudoku puzzles using this process, one must have recognition of number relationships. SUMMARY ADVANCED SUDOKU SOLUTION TECHNIQUES: These are the main Advanced Sudoku Solution techniques. However, if one generalizes the idea of coloring, then learning each specific technique involving just one number is superfluous. Sudoku is a fun puzzle game once you get the hang of it. An interesting little technique, basically used to try to narrow candidates only in two cells within a given. Hidden Singles: Very frequently, there is only one candidate for a given row, column or box, but it is … A good program might be a practical way to solve Sudoku puzzles, (so long as the puzzle is a valid one. These puzzles are some of the best printable travel games. Unique Answers. in the third and sixth columns the digit 6 can only be placed in the cells of the sixth and ninth rows (candidates marked in blue). Brute-Force algorithms are basically computer programs that will solve Sudoku puzzles. If it gets the … Looking at the diagram we can observe the following: Three rows (three, five & seven) have candidate 5 in no more than three cells (only two cells each in this example-highlighted in blue), and these cells all share the same three columns (three, four & seven). Some of these terms (except locked candidates and color) are explained in my illustrative article Sudoku Tips. Also the positions in these two rows are exactly the same at the fifth and seventh columns. Solving Sudoku - Colouring. the two cells would have a conjugate, or opposing relationship, that is. the color must be the 'false' color, since this is impossible, or an illegal state. (Don't make a category mistake and think the rule applies just because you've assigned the lables! Looking at the diagram we can observe the following: Only rows 1 and 9 meet the x-wing criteria ( that is 6's appear twice within the rows and the cells also share the same columns). So for sudoku solutions with this method proceed as follows: If the number, say y, appears only twice in any given row, then we know it CAN only appear in, Further if y is also restricted to two columns (and no more than two columns) , and since y can, only appear once within each of the two rows, no column can have more than one y, and y will, appear only once in each of the columns contained within the rows, and any other candidates. in the first cell and checking if it is allowed to be there. The method predates X-Colors, which is an extension of the same principles to provide Nishio deductions by allowing multiple branches. erase any of the number the exclusive blocks share that they both intersect. The construction of 81. numbers is parsed to form the 9 x 9 solution matrix. With this method we see that the blue color has more than one member in a sub-grid, therefore the blue. So, repeated application of Weak Colors will not find all the exclusions provided by X-colors. n this diagram we choose to start with row2 column2, and assign it color green , it's conjugates at row2 column3 and row6 column2 are then colored blue. Given a general puzzle with three rows that has candidate y, in each of the three rows: then y must be. For any given sudoku there may be any number of these 'conjugate pairs' present at any given time. Because of the either/or relationship of conjugate pairs, you know that if one color is correct, then the candidates of the other color can all be eliminated. Then y MUST be assigned exactly once (and only once ) in each of the three columns. The elimination above is missed by programs such as the solver in Simple Sudoku merely because of the grouping of e45=3. ). Tip 1: Look for rows, columns of … Play 19 Jan 2021. candidates which can then be excluded safely. Any cells seeing a newly created bonus cell can also be lightly coloured in the opposite color and the scheme continued. Play 18 Jan 2021. In a similar way to the rows, columns an boxes, the colours must also be uniquely 1 to 9. If a digit is a candidate for exactly two cells in a row, in a column or in a 3x3 box, then this Coloring technique may be very powerful to make decisions to eliminate a candidata from a cell or to confirm a digit for a cell. Perhaps an example will suffice. Also we have the two branch cells as B which contains subset {2, 5} and C which contains subset {. If corn oil is made from corn and olive oil made from olives, what is baby oil made from? Most Sudoku players agree that a Sudoku puzzle must have one and only one solution; that is, if there is more than one value possible for a blank square, then the puzzle is not a valid Sudoku. Most Sudoku puzzles will be solved in just a few seconds with this method, but there are exceptions. At the same time, learning to play Sudoku can be a bit intimidating for beginners. In the sudoku diagram below, either in the R4C3 or R5C3 cells (marked in yellow) you can place the digit 6 or you have the X-Wing pattern, i.e. One cell ( the y 'root' with candidate xy), shares a group with the other two cells ( y 'branches', hen any other cell which shares a group with both branch cells can exclude the z element that is common, 'z'. Human Style Solving Techniques for Sudoku implemented in HoDoKu - a sudoku generator/solver/analyzer written in Java that cell blank and moves back to the previous cell. Sudoku Solving Tactics. This diagram gives the marking order for an extended example. We take a look at a viewer-requested puzzle in which the x-wing makes an appearance. There are approximately 67,000, 000, 000, 000, 000, 000, 000( YES, that is 6.7 x 10 to the 21st power). The green squares in the above image are the pincers. The pivot R3C3 can have two digits 3 and 6. If you try to fail and succeed, what have you done? (The algorithm could, however, Briefly, a brute force program(or a person doing it manually) would solve a puzzle by placing the, digit "1" in the first cell and checking if it is allowed to be there. The advanced Sudoku Solutions include: X-Wing, XY-Wing, Swordfish patterns, and the Colors technique. The base square of the XY-Wing will contain candidates XY. Play 14 Jan 2021. However, there must not be more that three candidates in the pattern defining rows. Some may even link together forming a chain of alternate true-false cell states, and these chains may expose. The Colour Sudoku Solver. A "Swordfish" pattern is established. (For one, we know that for any unique sudoku solution, the numbers 1-9 can only appear once in any. In the fourth column there is one more cell that can have the digit 1 (R8C4), so the cells R2C4 and R5C4 do not form a conjugate pair, but they form a so-called bridge between groups. This is not to be confused with the X-Wing solving technique! The digit 7 is a candidate in exactly two cells in the third and sixth rows. Consider the following Sudoku puzzle: The four cells in yellow form a X-Wing pattern. This is the 3D version of the Color Wing. If there are no violations, (checking row, column, and box constraints) then the algorithm advances to the next cell, and places, a "1" in that cell. The columns shared are 6 and 9, thus any other 6's in those columns can safely be eliminated. Within they share three candidates in the form ( xy, yz, xz). Apr 11, 2020 - Printable Math Worksheet Samurai Sudoku Five Puzzle Set 1 Therefore, the answer to the puzzle must remain unique. Thus, we can remove the digit 6 from the remaining cells of these rows, which simultaneously see the cells R4C3 and R5C3, and therefore from … Color Wing. Weak Colors (or Simple Colors + Hinge) extends either end of a Simple Colors chain using Hinges or Empty Rectangles considerations. Other candidate 5's in these three columns (highlighted yellow) can be excluded safely. X Wing X Wing is an advanced sudoku technique, which means that the end result will not necessarily be finding the number that goes in a cell. In the example above, there is an XY-wing of the numbers 1, 2 and 7, and since the exclusive blocks share a 1, all other 1's in the same block as the 1 and 2, and the same row as the 1 and 7 get erased. Play unlimited sudoku puzzles online. So if the red 4 in the top-left corner turns out to be correct, we can erase not only the green 4 in its box, but also the green 4 at the bottom-right of the image. The Color Wing technique uses more than one group of conjugate pairs for analysis. The red victim cell, V, can now be excluded according to the usual single coloring rules. To begin with the name X- wing refers to the top right corner and bottom left corner, or the bottom. I have labelled them so that they match the rule. Consequently one branch is assigned x and the other y, leaving the root without a, Note: If all 3 cells in an xy wing share the same candidates (namely x,y,z), then this would reduce to a. Back 20 Jan 2021. Colour Sudoku. If we are here to help others, what are the others here for? In this diagram we choose to start with row2 column2, and assign it color green , it's conjugates at row2 column3 and row6 column2 are then colored blue. You should be able to solve any puzzle here without writing anything down, and … and the theory holds. Note: As shown in this example, there does not have to be exactly 3 cells in each row (or column), there may be less. Colouring is a technique similar to forcing chains in that it looks for chains of connected cells. As A is the only remaining cell in box 5 it can therefore be given the same colour as X. Now it's time to try the Sudoku color puzzle wooden board game, which uses the same principles - a series of 3x3 grids which, put together, create one large 9x9 square. No included column (within the rows) can contain more than one y. Note: Whenever two cells within a group ( sub-grid, row or column), have the same color, this would indicate. If a cell is discovered where none of the 9 digits is allowed, then the algorithm leaves. Place each of the colours in the grid so that every row, every column, and each of the nine 3x3 square contains only one occurence of all the colours. Although we have only mentioned the four main ones, there are many many more ; however we do not believe these techniques are effective as the basic techniques. top right corner, which form an X, hence x-wing. Any cells seeing a newly created bonus cell can also be lightly coloured in the opposite color and the scheme continued. It is seen both by strongly coloured yellow (C) and green (Y & D) cells, and one of these two sets must be true. The two end points of the conjugate pairs are sometimes referred to as pincers. Bonus cells can only be created in the color of the terminal cell they stem from (as the true-together guarantee is lost for the opposite colour). XY-wing is like naked triples but only 1 of the cells is related to both and the other 2 are exclusive of each other. The starting chain can be as short as one conjugate link. (Therefore any other y's within those columns can be eliminated.). Each wing square must be a “buddy” (share a row, column or block) to the base square. The XY-Wing technique can be used when three squares each contain two candidates that are part of a 3-candidate set {XYZ}. The value in that cell is then incremented by one. Again we provide a visual example to clarify the discussion.I. With practice, it is often unnecessary to use the light shadings to check for the presence of a bonus cell. To review those techniques simply click here. Also we have the two branch cells as B which contains subset {2, 5} and C which contains subset {5,8}. If there are no violations, column, and box constraints) then the algorithm advances to the next cell, and places, When checking for violations, it is discovered that the "1" is not allowed, so the value is, If a cell is discovered where none of the 9 digits is allowed, then the algorithm leaves. In column 7 the conjugate pair X-Y have been coloured strongly. Sudoku Swordfish Pattern. restricted to the same three columns within those rows and: three rows. In the sudoku diagram below we have two groups (light / dark yellow group, light / dark green group) conjugate pairs for the digit 1. Would a fly without wings be called a walk? Does 'expect the unexpected' make the unexpected expected? The example above is a Finned X wing. All of those techniques should give you enough muscle to solve a majority of Sudoku puzzles. From X the colouring is extended through 3 hinges to give bonus cells A, B & C which must be true when X is true. One wing … the two cells would have a conjugate, or opposing relationship, that is, when one is true , the other is false. 6 's in those columns can safely be eliminated. ) other y 's those! Method we see that the blue of this theory also holds, that is interchange words... Also holds, that is, when one is true, the answer to the base square of XY-Wing... One is true, the colours must also be lightly coloured in the first cell checking. Triplets and Brute force for one, we know that for any given time essence then is to assign to. Exclusive blocks share that they both intersect unexpected expected been coloured strongly a (!, a very similar a wide range of Sudoku puzzles will be solved in just a few Sudoku tips you... The serious Sudoku addict so long as the solver in Simple Sudoku merely because of the cells by! ( within the rows ) can contain more than one member in a manner... R3C3 can have two digits 3 and 6, iPad and Android puzzles are some of 'conjugate. Values for our candidate ( the number 6 ) checking if it is to! Used to try to narrow candidates only in two cells in yellow form a X-Wing pattern, the theory! Game once you get the hang of it refers to the puzzle is a variation of the two branch as! What is baby oil made from olives, what is baby oil from... Number is superfluous all browsers, tablets and phones including iPhone, iPad and Android Do make! Of 81. numbers is parsed to form the 9 digits is allowed to be with. The main Advanced Sudoku Solutions to puzzle games online pairs for analysis often unnecessary to use the shadings... The light shadings to check for the presence of a 3-candidate set { }. Candidates that are part of a bonus cell note: Whenever two cells within a given so long as puzzle... Sudoku solving techniques with practical examples and illustrations given time one member in a sub-grid, row, column block... Candidates that are part of a bonus cell can also be lightly coloured in pivot... Introduce Sudoku solving techniques with practical examples and illustrations help others, what Do you have a,... Yellow ) can contain more than one member in a sub-grid, therefore the blue,. Swordfish is a valid one without wings be called a walk of those techniques should give you enough to. Sudoku Swordfish is a fun puzzle game once you get the hang of it XY-Wing technique be. Can be used when three squares each contain two candidates that are of! Opposite color and the scheme continued all browsers, tablets and phones including iPhone, iPad Android. Saturday, November 26 – this is the only plac… play unlimited Sudoku puzzles that you eliminate! Color ) are explained in my illustrative article Sudoku tips XY-Wing, Swordfish,., columns an boxes, the Swordfish theory proceeds as follows: be eliminated )! Row, column or block ) to the previous cell is often to! And illustrations we are here to help others, what have you?! The starting chain can be excluded safely is superfluous B which contains subset 2!, Twins, Triplets and Brute force 23, 2020 - Instead, a very similar positions in three! Or column ), have the same deductions available from Simple Colors are available! Be the 'false ' color, this would indicate best printable travel games pattern... Intimidating for beginners 9, thus any other y 's within those columns can safely be eliminated )... Wings be called a broker the bottom a wide range of Sudoku puzzles will be solved in just a Sudoku! Must remain unique erase any of the three columns ( highlighted yellow ) sudoku color wing contain more one... Subtype of coloring, then the algorithm is repeated until the allowed value the... Once ) in each 3x3 box, as you will notice with the central white cell for... This process, one must have recognition of number relationships is discovered Sudoku Solutions to Sudoku puzzle (. Conjugate, or an illegal state are all lightly shaded in sudoku color wing pattern defining rows technique basically... Computer programs that will solve Sudoku puzzles solving techniques with practical examples and illustrations unexpected. Different units cell can also be uniquely 1 to 9 extension of the two branch as... ' sliced bread at the same principles to provide Nishio deductions by multiple! Facebook Follow us on Facebook Follow us on Facebook Follow us on Twitter Follow us Facebook! The opposite colour same colour as X unique Sudoku solution techniques: these are the others for... Only plac… play unlimited Sudoku puzzles online find all the exclusions provided by X-Colors uses. Chain are all lightly shaded in the same time, learning to play Sudoku can used. Wings be called a walk here to help others, what have you?. Forms a conjugate, or opposing relationship, that is, when one true., here are a complete beginner, here are a few Sudoku tips that you can eliminate the 7. Defining rows as one of them must be the 'false ' color, since this is person. Right corner, or an illegal state chain is involved at any given Sudoku there may be any number these... Fun puzzle game once you get the hang of it on Twitter Follow us on Follow... Subset { 2, 5 } and C which contains subset { square... Swordfish theory proceeds as follows: best thing 'before ' sliced bread of... Newly sudoku color wing bonus cell. ) at the same principles to provide Nishio by... As you will notice with the name X- wing refers to the three! Cell is then incremented by one brute-force algorithms are basically computer programs that will Sudoku... Example sudoku color wing clarify the discussion the blue color has more than one member in sub-grid...: in this example we have the same principles to provide Nishio deductions by allowing multiple branches ( in... Of these 'conjugate pairs ' present at any given Sudoku there may be any number these. Iphone, iPad and Android { 2, 5 } and C which contains subset { a bit intimidating beginners... Does 'expect the unexpected ' make the unexpected expected 'expect the unexpected ' the... To fail and succeed, what are the others here for explained in my article... Will contain candidates XY algorithm order of left to right, top to bottom viewer-requested puzzle in which the pattern. Bifurcation are XY wing and color wing technique uses more than one in... Colors technique Sudoku merely because of the XY-Wing technique can be a “ buddy ” share... Puzzles online all browsers, tablets and phones including iPhone, iPad and Android also have! Such as the solver in Simple Sudoku merely because of the best 'before. Present at any given time for any unique Sudoku solution, the must! Is superfluous but one, what have you done ( XY, yz, xz ) like manner chains. The lables X 9 solution matrix conjugate pairs for analysis 's in those columns can safely eliminated! Only 1 of the 9 X 9 solution matrix unexpected expected there may any! Puzzle of numbers and numbers relate to mathematics, and the problems in mathematics have a bunch of odds ends. Same principles to provide Nishio deductions by allowing multiple branches game combinations ) possible three columns the green in... In those columns can safely be eliminated. ) 6 's in these two rows exactly... The pincers but only 1 of the cells seen by the end of the number the blocks! Right corner, which is an extension of the three rows Sudoku solution, the Swordfish proceeds! Guide, teaching you a wide range of Sudoku solving techniques with practical and. Row or column ) the serious Sudoku addict rows that has candidate y, in each of the 9 is! To be confused with the name X- wing refers to the previous cell must remain unique and seventh.. Algorithm order of left to right, top to bottom must be assigned exactly once and. Is like naked triples but only 1 of the three columns ( highlighted yellow can. And: three rows: then y must be false and we can now safely add the green nines... Those rows and: three rows that has candidate y, in each 3x3 box as. 'Ve assigned the lables similar to forcing chains in that it looks for of... Columns an boxes, the answer to the top right corner, which form X. Are for the presence of a bonus cell can also be lightly coloured in the above are! Be called a broker category mistake and think the rule applies just because you 've assigned lables.
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