The affix ām is optionally used after these - uṣ 'to burn', vid 'to know' and jāgṛ 'to wake', when liṭ (Perfect Tense) follows.,
Thus ओषाञ्चकार or उवोष, विदाञ्चकार or विवेद, जागराञ्चकार or जजागार. As there is an agreement in the present instance to regard the verb विद as ending in a short अ, guna is not substituted, as it would otherwise have been by rule 7.3.86.,