I think I understand the two-step process. The goal is to find two squares A and B such that A XOR B will give you the position of the key, so the trick is to treat the initial configuration as A and the final configuration as B.
It's an interesting trick.
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I think I understand the two-step process. The goal is to find two squares A and B such that A XOR B will give you the position of the key, so the trick is to treat the initial configuration as A and the final configuration as B.
It's an interesting trick.