ضَحِكْنَ • (ḍaḥikna) (form I)
ضَحِّكْنَ • (ḍaḥḥikna) (form II)
ضَحَّكْنَ • (ḍaḥḥakna) (form II)
ضُحِّكْنَ • (ḍuḥḥikna) (form II)