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Benchmark: running substr, vec for at least 60 CPU seconds...
    substr: 61 wallclock secs (62.41 usr +  0.02 sys = 62.42 CPU) @  1
+.09/s (n=68)
...
       s/iter    vec substr
vec      1.38     --   -33%
substr  0.918    50%     --

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use strict;
use warnings;
...
######################################################################
+#########

cmpthese(timethese(-60, \%subs));