For the n dimensional case it would be better to say that x and y lie on opposite vertices of the n-hypercuboid such that each edge is parallel to a coordinate axis.
nice trick :)
Make a checkerboard matrix
Back to basics 8 - Matrix Diagonals
Getting the absolute index from a matrix
Cell Counting: How Many Draws?
the fly, the train, the second train, and their Zeno's paradox
Knights and Knaves (part 2)
love is an n-letter word
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