public function step4()
    {
        //    ement  ance   ence  able ible   ant  ment   ent   ism   ate   iti   ous   ive   ize al  er   ic
        //      delete
        if ( ($position = $this->search(array(
            'ance', 'ence', 'ement', 'able', 'ible', 'ant', 'ment', 'ent', 'ism',
            'ate', 'iti', 'ous', 'ive', 'ize', 'al', 'er', 'ic'))) !== false) {

            if ($this->inR2($position)) {
                $this->word = Utf8::substr($this->word, 0, $position);
            }
            return true;
        }

        // ion
        //      delete if preceded by s or t
        if ( ($position = $this->searchIfInR2(array('ion'))) !== false) {
            $before = $position - 1;
            $letter = Utf8::substr($this->word, $before, 1);

            if ($letter == 's' || $letter == 't') {
                $this->word = Utf8::substr($this->word, 0, $position);
            }

            return true;
        }

        return false;
    }