When you use the -p option, the output also includes parentheses even when they are not required by precedence, which can make it easy to see if perl is parsing your expressions the way you intended.

thank you. maybe easier to see. 

perl -MO=Deparse,-p -anle "print $F[3];" tmp.txt

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This showed me what is -a,n,l.

In reply to Re^4: strange boolean algebra behaviour by remiah
in thread strange boolean algebra behaviour by vlad_tepesch

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