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  1. or download this
     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
    
  2. or download this
    $h=$ENV{HOME};my@q=split/\n\n/,`cat $h/.quotes`;$s="$h/."
    ."signature";$t=`cat $s`;print$t,"\n",$q[rand($#q)],"\n";