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                 Rate ikegami_sort   ikegami         op op_nosort
ikegami_sort   4.68/s           --       -1%       -75%%      -91%
ikegami        4.72/s           1%        --       -75%%      -91%
op             19.1/s         308%      304%         --%      -62%
op_nosort      50.6/s         981%      970%       165%        --

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                  Rate ikegami_sort   ikegami        op op_nosort
ikegami_sort   0.345/s           --       -1%      -68%      -88%
ikegami        0.348/s           1%        --      -68%      -88%
op              1.08/s         214%      212%        --      -63%
op_nosort       2.90/s         738%      733%      167%        --

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use Benchmark qw/cmpthese timethese :hireswallclock/;

...
    my @refs = @allrefs[ sort { $a <=> $b } grep $keep{$_}, 0..$#allre
+fs ];
}