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use Benchmark qw( cmpthese ) ;

...
                } 
                return 1;
              }

       Rate    u1    u2    u5    u3    u4
...
u5 102215/s  868%  184%    --  -32%  -32%
u3 149240/s 1314%  315%   46%    --   -1%
u4 150091/s 1322%  317%   47%    1%    --