Sūtra 1·4·13
यस्मात् प्रत्ययविधिस् तदादि प्रत्यये ऽङ्गम्
yasmāt pratyayavidhis tadādi pratyaye 'ṅgam
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After whatsoever there is an affix enjoined, whether verbal root or crude-form, that which begins therewith in the form in which it appears when the affix follows it, is called an Inflective base (aṅga).
Padapāṭha yasmāt pratyayavidhiḥ tadādi pratyaye aṅgamयस्मात् प्रत्ययविधिः तदादि प्रत्यये अङ्गम्