The penultimate of curādi (10th Conjugation) - chad is shortened before the affix gha -- puṃsi saṃjñāyāṃ ghaḥ prāyeṇa [[3.3.118]], when not preceded by two prepositions (or more).,
As उरश्छदः, प्रच्छदः, दन्तच्छदः ॥ But समुपच्छादः with two prepositions. The same when preceded by more than two prepositions, as समुपातिच्छादः ॥ The elision of णि of छादि &c., by 6.4.51, should not be considered as asiddha 6.4.22 or sthanivat 1.1.57, otherwise there would be no penultimate to be shortened.
Vart:- The prohibition with regard to द्वि should be extended to numbers more than two.,