Practice matrix traversals

Recently I've been asked a few interview questions that involve reading from or
writing to a grid, matrix, game board, etc. I am not as fast as I'd like to be
at this, so I'm going practice.

Here I'm practicing reading from existing matrices. I should practice writing to
empty boards, reading neigboring cells, wrapping around the board (in the case
of Conway's Game of Life), and other useful practices.

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