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Good afternoon I am currently trying to self teach myself about combinatorics and this is the first time I have ever seen the following chart can anyone explain me why it’s set up in such a manner what does it mean?

I am dealing with grids (chess board) and guaranteeing perfect Covers with dominos.

enter image description here

Any links, sources, explanations on how to read this type of chart would be helpful thank you.

Josue
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    They are simply indexing the colours instead of shading them. You could colour each cell with a $1$ red, each $2$ green, each $3$ yellow, and so on. – Théophile Jul 23 '20 at 18:46
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    You've seen a checkerboard or chessboard, right? The colors of the squares have particular meaning to their respective games (in checkers/draughts, the pieces are all placed on spaces of the same color for instance and move diagonally). Well... imagine a game where the board has more than just two colors and said colors are lined up diagonally. – JMoravitz Jul 23 '20 at 18:47
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    If you need an actual image or problem which uses more than two colors to be able to understand it... see for instance this problem where we colored a chessboard rather than with the traditional two colors instead with three colors in order to prove a point. – JMoravitz Jul 23 '20 at 18:48
  • @JMoravitz, and Théophile, thank you for not disregarding this as trivial trash I really appreciate it. – Josue Jul 23 '20 at 18:52
  • Glad to help! Mathematicians have a fairly abstract understanding of what colours are... :) – Théophile Jul 23 '20 at 18:54

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