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use Benchmark qw( cmpthese ) ;

...

} );
__END__

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All unique (2491306578):
       Rate    u1    u2    u3    u4    u9
...
u4  556425/s  3769%  1003%     5%     --   -64%
u9 1539566/s 10606%  2953%   190%   177%     --