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If you're only using three at a time, you could always do this:
sub is_ok { $_[0][0] != $_[1][0] && $_[0][0] != $_[1][1] && $_[0][0] != $_[1][2] && $_[0][1] != $_[1][0] && $_[0][1] != $_[1][1] && $_[0][1] != $_[1][2] && $_[0][2] != $_[1][0] && $_[0][2] != $_[1][1] && $_[0][2] != $_[1][2]; }
Very rudimentary, but at the same time, this "unrolled" version is way faster than any list or hash based operation. Using a quick Benchmark test, it was 80% faster than other bits posted here.

In reply to Re: Pair of items by tadman
in thread Pair of items by artist

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