Variable number of nested loops begs for Algorithm::Loops's NestedLoops. 
use Algorithm::Loops qw( NestedLoops );

for my $depth (2..3) {
   NestedLoops(
      [ ([ 0..3 ]) x $depth ],
      sub {
         print(join(', ', @_), "\n");
      },
   );
}

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In reply to Re: Incremental indexing exponential by ikegami
in thread Incremental indexing exponential by FFRANK

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