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    Collatz(63728127) has sequence length of 950 steps
Collatz(95592191) has sequence length of 948 steps
...
Collatz(46564287) has sequence length of 735 steps
Collatz(69846431) has sequence length of 733 steps
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    1e8: parallel, 32 cores (File::Map, pack, unpack):
  https://www.perlmonks.org/?node_id=11115544
...
        iM71 + updates   48.673s
    Step counting in C   19.023s