Dear Michele, Could you check this line: https://github.com/php-gettext/Languages/blob/main/src/FormulaConverter.php#L137 ````php $chunk = "{$what} != {$from} && {$what} == {$to}"; ```` Shouldn't the condition be: (what ≠ from) and (what ≠ to)? Thanks again! Best wishes from Vienna, Marcus