Reasoning

Square-Flip Invariant

Difficulty
xx \(x \xxxxx x\) xxxx xxxxxxxx xxxx xxxxx xxx xxxx. xx xxxx xxxx, xxxxxx xx xxxx-xxxxxxx \(x \xxxxx x\) xx \(x \xxxxx x\) xxxxxx xxxxxxxx xxxxxx xxx xxxx xxx xxxx xxxxx xxxxx xx xx: xxxxx xxxxxx xxxx, xxx xxxx xxxxxx xxxxx. xxx xxx xxxx xx xxxx xxxxx xx xxx xxxx. xxx xxxxx xxxxxxxx xxxxxxxxxxx xx xxxxxxxxxxx xxxx xx xxx-xxxx xxxx? xxxxxxx xxxx xxxxxx.

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