my $low = set( 0..4 );
 my $odd = set( (0..4).map:{ $_ * 2 + 1 } );

 say $low ∋ 4;   # true 
 say ($low ∖ $odd).members.join(",");  # 0,2,4 
 say ( $low ∪ $odd ) ⊇ $low;   # true 



##</code><code>##

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