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use Benchmark qw( cmpthese ) ;
...
} );
__END__

All unique:
       Rate    u1    u2    u3    u4
...
u2  62887/s  262%    --  -92%  -92%
u3 748300/s 4202% 1090%    --   -5%
u4 783739/s 4405% 1146%    5%    --