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my $low = set( 0..4 ); my $odd = set( (0..4).map:{ $_ * 2 + 1 } ); ... say ($low ∖ $odd).members.join(","); # 0,2,4 say ( $low ∪ $odd ) ⊇ $low; # true
$h=$ENV{HOME};my@q=split/\n\n/,`cat $h/.quotes`;$s="$h/." ."signature";$t=`cat $s`;print$t,"\n",$q[rand($#q)],"\n";