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Possible precedence problem on bitwise & operator at pdl-gameoflife.pl + line 24, <DATA> line 207. Possible precedence problem on bitwise | operator at pdl-gameoflife.pl + line 25, <DATA> line 207.
return ( ($tmp == 4) & ($pdl == 1) ) | # Alive +3 neighbors ( $tmp == 3); # Alive +2 neighbors or dead +3 neighbors