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861. The favored relation

a. In order, however, to bring about the favored relation of heavy reduplication and light radical syllable, a heavy root is sometimes made light: either by shortening its vowel, as inarīradham from √rādh, avīvaçam from √vāç, asīṣadham from √sādh, ajījivam from √jīv, adīdipam (K. and later: BV. has didīpas) from √dīp, abībhiṣam from √bhīṣ, asūsucam from √sūc; or by dropping a penultimate nasal, as in acikradam from √krand, asiṣyadam from √syand.

b. In those cases in which (1047) an aorist is formed directly from a causal stem in āp, the ā is abbreviated to i: thus, atiṣṭhipam etc., ajijñipat (but KSS. ajijñapat), jīhipas, ajījipata (but VS. ajījapata); but from çrap comes açiçrapāma (ÇB.).