@$tophash{$value}{$value2}
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Uh, you're missing a curly set:

@{$tophash{$value}{$value2}}
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Without that, it parses like:

$tophash must be a hashref, so deref it as a slice with $value being the (only) key, then take that slice (ugh) and deref it (them?) as a hashref with $value2 for the key.

Definitely perverted. Almost certainly wrong.

-- Randal L. Schwartz, Perl hacker