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  1. or download this
    use strict;
use warnings;
...

say {*STDERR} time - $t;
  2. or download this
    use strict;
use warnings;
...

say {*STDERR} time - $t;
  3. or download this
    1e7:
    serial    15.311s   1 core
...
Collatz(46564287) has sequence length of 735 steps
Collatz(69846431) has sequence length of 733 steps