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# within
while (my $x = $count) {
...
Benchmark: timing 10 iterations of within, without...
    within: 40 wallclock secs (39.78 usr +  0.04 sys = 39.82 CPU) @  0
+.25/s (n=10)
   without: 35 wallclock secs (35.09 usr +  0.00 sys = 35.09 CPU) @  0
+.28/s (n=10)