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  1. or download this
    pugs> sub foo { [~] map -> $a, $b { lc $a, uc $b }, @_ };
pugs> say foo <FoO bAr BaZ>;
fooBARbaz
  2. or download this
    pugs> sub prod (int $n, int $m) { [*] $n..$m };
pugs> say prod 3, 6;
360