Sūtra 8·2·9
मादुपधायाश् च मतोर् वो ऽयवादिभ्यः
mādupadhāyāś ca mator vo 'yavādibhyaḥ
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For the m of the affix mat is substituted va, if the stem ends in m or a (and ā) or if these are in the penultimate position; but not after yava and the rest.
Padapāṭha mātupadhāyāḥ ca matoḥ vaḥ ayavaādibhyaḥमातुपधायाः च मतोः वः अयवआदिभ्यः