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One way to make a two dimensional array: do it in physical space.
Create an NxM matrix of cubes. Creates another cube to be your "head" which is used to read and write to the matrix.
Index them using the x and y coordinate, corresponding to 0 through N and 0 through M.
Store values in them using color- use just one channel, such as red. This allows you to store a number from zero to one in each of them.
Set the logic on the head so it can go to location x,y given two inputs. A directional, narrow wireless receiver can read whats on the square below it. A little more logic can write to it and change the color.
Setting them to non collidable, invisible, and looser can help the optimization.