Consider some of the more obscure tests that implementations must pass:
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Number (2): Everything in this space must add up to 2. The answer is 2-1, placed horizontally; 1-4, placed vertically.
循着航道继续向前，抵达188米高的2号边坡。站在坡顶俯瞰，马道枢纽卧于山坳之间，蔚为大观。