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use MCE::Simple -strict, (
    spawn_limit => 2,  # MCE::Child processes
...
}

sync;

60264: 10  # alternating PIDs
60265: 11  # two MCE workers
...
60275: 36
60276: 37
60277: 38

spawn my $i (30..38) {
    say "$$: $i";
...
    say "$$: $i";
}); }