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use Benchmark qw(timethese);
use strict;
...
    }
    return 0;
}

Benchmark: timing 100 iterations of granfather, usual...
granfather:  4 wallclock secs ( 3.58 usr +  0.00 sys =  3.58 CPU) @ 27
+.95/s (n=1
00)
     usual:  4 wallclock secs ( 4.13 usr +  0.00 sys =  4.13 CPU) @ 24
+.24/s (n=1
00)

Benchmark: timing 100 iterations of granfather, usual...
granfather:  3 wallclock secs ( 3.58 usr +  0.00 sys =  3.58 CPU) @ 27
+.95/s (n=1
00)
     usual:  0 wallclock secs ( 0.00 usr +  0.00 sys =  0.00 CPU)
            (warning: too few iterations for a reliable count)

Benchmark: timing 100 iterations of granfather, usual...
granfather:  4 wallclock secs ( 3.69 usr +  0.03 sys =  3.72 CPU) @ 26
+.89/s (n=1
00)
     usual:  2 wallclock secs ( 2.08 usr +  0.00 sys =  2.08 CPU) @ 48
+.12/s (n=1
00)