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@dict = qw (foo oof fff bar baz);
$letters = 'ofo';
...
push @{$dict{rle(sort split '',$_)}}, $_ for @dict;
$words = $dict{rle(sort split '',$letters)} || [];
print "$_\n" for @$words;

my %dict;
push @{$dict{join('', sort split '',$_)}}, $_ for @dict;
$words = $dict{join('', sort split '',$letters)} || [];
print "$_\n" for @$words;