Of course, to satisfy the "tens of thousands of keywords", you really should be using 'kaaa'..'kzzz' and 'iaaa'..'izzz'.

Of course, when I did that my method blew through all available memory when trying to compute 5-at-a-time. It did manage 4-at-a-time, though, and in under five minutes. 

--
@/=map{[/./g]}qw/.h_nJ Xapou cets krht ele_ r_ra/;
map{y/X_/\n /;print}map{pop@$_}@/for@/

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In reply to Re^2: algorithm for 'best subsets' by fizbin
in thread algorithm for 'best subsets' by halley

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