आर्धधातुके

From this up to युप्लुवोर्दीर्घश्छन्दसि 6.4.68, inclusive, is always to be supplied the words ' before an affix called आर्धधातुक -- आर्द्धधातुकं शेषः 3.4.114 etc.'
This is an adhikara sutra and extends upto 6.4.69 (exclusive). In all the sutras upto 6.4.68 should be supplied the phrase "before an affix called ardhadhatuka". Thus 6.4.48 teaches "the अ standing at the end of a verbal stem is elided". To complete the sense we should add: "before an ardhadhatuka affix". Thus the final अ of the verbal stem चिकीर्ष is elided before the ardhadhatuka affix तृ, as चिकीर्षितृ, जिहीर्षितृ, but the final अ is not elided before a sarvadhatuka affix, as the अ of भव in भवति, भवतः ॥ The luk-elision of शप् after roots of अदादि class, implies that there is never lopa of शप् ॥

The following purposes are served by this sutra, i. e. an ardhatuka affix causes the following special changes (1) अतोलोपः - The elision of अ of a stem, as shown above, in चिकीर्षिता, चिकीर्षितुम्, (2) यलोपश्च, The elision of य by 6.4.49, 6.4.50 : as बेभिदिता, बेभिदितुम्, बेभिदितव्यम् from बेभिद्य the Intensive stem. Before Sarvadhatuka, we have बेभिद्यते, चेच्छिद्यते ॥ (3) णिलोपश्च प्रयोजनम्, The elision of णि by 6.4.51, as कारणा हारणा पाच्यते (पाचि + यक् + ते = पाच् + य + ते), याज्यते ॥ In Sarvadhatuka, पाचयति, याजयति, कारयति, हारयति ॥ (4) आल्लोपः, the elision of आ, 6.4.64 -- as पपतुः, पपुः, ववतुः ववुः, In Sarvadhatuka, यान्ति, वान्ति (5) ईत्वम् -- The substitution of long ई for आ in some roots, 6.4.65 as धीयते, दीयते; in Sarvadhatuka अदाताम्, अधाताम् (6) एत्वम् -- The substitution of ए for आ, 6.4.68; as स्नेयात्, ग्लेयात्; in Sarvadhatuka, स्नायात्, ग्लायात् ॥ This is confined to the Precative (asirlin). (7) चिण्वद्भावश्च सीयुटि, the treatment of the Precative like Aorist Passive in चिण्, by 6.4.62. as कारिषीट, हारिषीट ॥ In Sarvadhatuka क्रियेत, ह्रियेत ॥

_Kaisika :-

अतो लोपो यलोपश्च णिलोपश्च प्रयोजनम् ।
आल्लोप ईत्वमेत्वं च चिण्वभावश्च सीयुटि ॥