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  1. or download this
    my @x = map join( '', @$_ ), variations_with_repetition( ["a".."z"], 4
+ );;

print scalar @x;;
456976
  2. or download this
    [ 7:10:21.87] C:\test>perl -MAlgorithm::Combinatorics=:all -le"print s
+calar( () = variations_with_repetition( ["a".."z"], $ARGV[0] ) )" 4
456976

[ 7:10:27.12] C:\test>