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use warnings;
use strict;
...
print "done\n";

__END__

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testing on 3 elements
                 Rate schwartzian      swap   weight    shift       ma
+p       xs
...
swap        18.7/s        319%      203%       19%       11%        --
+      -77%
xs          82.0/s       1739%     1227%      422%      388%      339%
+        --
done