public function restorePrefix()
    {
        foreach ($this->removals as $i => $removal) {
            if ($removal->getAffixType() == 'DP') {
                // return the word before precoding (the subject of first prefix removal)
                $this->setCurrentWord($removal->getSubject());
                break;
            }
        }

        foreach ($this->removals as $i => $removal) {
            if ($removal->getAffixType() == 'DP') {
                unset($this->removals[$i]);
            }
        }
    }