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print map {"$_->[0]\n"} sort {$a->[1] <=> $b->[1]} map { [$_, (/C(\d*)/)[0]] } grep { /P/} @compounds;
Always Always on Perls where it is no longer experimental Sometimes, such as when I deem the syntax to be clearer with it than without Only if the existing code base uses it or a standards doc mandates it Arbitrarily/Randomly Never Never heard of it I'm still supporting 5.6.0, you insensitive clod!
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