Seems like this should be straightforward:
my @list = sort { @$a <=> @$b
or join(' ', reverse @$a) cmp join(' ', reverse @$b)
} @input;
Does that fit the bill? Seems like my understanding of the spec is inconsistent with the other implementations, so I don't know if I've missed something.
If the array operations turn pricey, you could optimize with an Orcish Maneuver.
#11929 First ask yourself `How would I do this without a computer?' Then have the computer do it the same way.
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