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Yeah, it's impossible....that's the official answer.

They gave the example of naming each spot alternately ABAB..., from left to right, starting in the 1st row.....etc, so 2nd row would start BABA...etc.

There are 13 A's and 12 B's (25 spots total). Each A would have to move to a B and vice versa, by definition. The numbers don't match.

Damn....I hate it when puzzles turn out to be "IMPOSSIBLE"....what a waste of time!!

Sorry folks.
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