public function combine($form1, $form2, $act2)
 {
     // Ex.: _k + miut > _ngmiut
     return substr($form1, 0, strlen($form1) - 1) . Orthography::latinICIOrthography(Roman::latinNasalOfUnvoicedStopConsonant($form1[strlen($form1) - 1])) . $form2;
 }