Ah, got it. I've modified the call to: NestedLoops(
[
( sub {
my $prefix = join '', @x[@_];
[ grep !$seen{$prefix . $x[$_]}++, ($_ ? $_ + 1 : @_) .. $#x ]
+;
} ) x $n,
],
sub {
my $ssx = join '', @x[@_];
$count += (matchss($ssx, $y) or return) * matchss($ssx, $x);
},
);
.. and that's working fine; a dump of %seen confirms that it is seeing only genuine repeats.
Of course, now that I've unified the loop specifier, it feels slightly wasteful having to create $n copies of the same subref, but I can live with that. :)
Thanks for the help.
Hugo
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