!!!$tp is the same as just !$tp, and it's not equivalent to $tp ? 0 : 1. 
$ perl -E'$tp=1; say "[", !$tp, "]";'
[]

$ perl -E'$tp=1; say "[", $tp ? 0 : 1, "]";'
[0]

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In reply to Re^3: How to Do Multiple OR in For Loops by ikegami
in thread How to Do Multiple OR in For Loops by neversaint

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