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use Benchmark qw/timethese/;

...
sub flatten {
    ;
}

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Benchmark: timing 10000 iterations of flatten, straight...
   flatten:  6 wallclock secs ( 5.08 usr +  0.00 sys =  5.08 CPU) @ 19
+69.28/s (n
=10000)
  straight:  0 wallclock secs ( 0.00 usr +  0.00 sys =  0.00 CPU)
            (warning: too few iterations for a reliable count)