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---- [ Formula: hsin ] ------------------------------------
perl      - distance from BWI to LAX: 2324.06319758555 miles
...
perl       16439/s        --      -24%      -98%
gis::fast  21721/s       32%        --      -97%
xs        771011/s     4590%     3450%        --

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#!/usr/bin/env perl
use strict;
...
    cmpthese $benchmarks;
    print "\n";
}