The same verb should be used after the gerunds formed from the verbs kaṣ 'to rub' etc. as the verb from which the gerund is derived.,
From sutra 3.4.34 up to sutra 3.4.45, a verb from the same root must be employed in the subsequent part, as anuprayoga, from which the gerund in namul was formed. This rule has been illustrated in the examples under the previous aphorisms.
The present is a restrictive or niyama rule. This chapter deals with affixes employed in denoting syntactical relation between two verbs (धातुसम्बन्धे प्रत्ययाः)। See 3.4.1 : so a gerund in namul, would, of course, be followed by some verb as anuprayoga; the present sutra declares that the other verb must be from the same root as the gerund.,