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These nodes all have stuff by icanhezperl (showing 1-2 out of ~2?):

Node ID Writeup Created
1210999 Re: map() and grep() suppress "Can't use an undefined value as an ARRAY reference at ..." errors 2018-03-15 21:06
1210995 map() and grep() suppress "Can't use an undefined value as an ARRAY reference at ..." errors 2018-03-15 20:34