there's what seems like a million similar variations here, so it's hard to catch all of them, and for that I apologize in advance. but it's a fun problem...
Author adum
Difficulty 7 kyu (history)
AVG solve time 31 sec
User attempts 2831 / 9502
Genre life and death
Similar problems
Created 2000-12-04
Source classic
Stars 4.42  (19 votes)
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Your attempts N/A