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  1. or download this
    #! perl -slw
use strict;
...
iterative:  Got 24157816; took  0.000416 seconds
calculate:  Got 24157816; took  0.000073 seconds
  2. or download this
    #! perl -slw
use strict;
...
18 : 2584
19 : 4181
20 : 6765
  3. or download this
    package futures;
use threads;
...

1;