54. Chā ṭṭha + ṭṭhamāti
Chasaddā pūraṇatthe ṭṭha + ṭṭhamā .
Channaṃ pūraṇo chaṭṭho , chaṭṭhamo .
Itthiyaṃ chaṭṭhī , chaṭṭhamī .
‘‘ Catutthadutiyesve + saṃ tatiyapaṭhamā ’’ ti nipātanā pūraṇatthe dvito tiyo dvissa du ca , ticatūhi tissa a , tiya + tthā ca yathākkamaṃ , dutiyo tatiyo , catuttho .