Changes To Corner Cases
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1 +flood2: 2 +RRUDRRULURULLLDDLDW ==> broken 3 +RRUDRRULURULLLDDLDL ==> safe escape 4 + 5 +if air==0 && reach_open_lifting is the same timing, it is safe.
Fossil version [8d758d3715] 2012-10-22 12:48:04