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foreach my $i (0..$#$types) {
    if ($i && $i == $#$types) {
...
    } elsif ($i) {
                $sentence .= ', ';
            }

for(@$types) {
    if($_ eq $types->[-1]) {
        $sentence .= $matches>1 ? ' and ' : ' or '
    } else { $sentence .= ', ' }