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608. A small number of roots

A small number of roots add in the present-system a ch, or substitute a ch for their final consonant, and form a stem ending in cha or chá, which is then inflected like any a-stem. This is historically, doubtless, a true class-sign, analogous with the rest; but the verbs showing it are so few, and in formation so irregular, that they are not well to be put together into a class, but may best be treated as special cases falling under the other classes.

a. Roots adding ch are  and yu, which make the stems ṛcchá and yúccha.

b. Roots substituting ch for their final are iṣuṣ (or vas shine), gamyam, which make the stems iccháucchágácchayáccha.

c. Of the so-called roots ending in ch, several are more or less clearly stems, whose use has been extended from the present to other systems of tenses.