If a light is on,it must be toggled an odd number of times to be turned off.If a light is off,it must be toggled an even number of times for it to remain off.A successful solution is therefore a equence of presses that toggles all the "on" lights an odd number of times and all the "off" lights an even number of times.
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말이 필요없는 게임이죠.. 체스게임 입니다.
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