एत्य्-एधत्य्-ऊठ्सु

The whole of the last sutra and आत् are understood here. The एच् of the last sutra qualifies the root इ in एति, i. e. when the root इ assumes the form ए by internal changes, then apples this Vriddhi rule. The एच् does not qualify the root एध् as that root always has an initial diphthong, nor does एच् qualify ऊठ् for ऊ is not a diphthong. Thus उप + एति = उपैति, उप + एषि = उपैषि, उपैमि; उप + एधते = उपैधते, प्रैधते; प्रष्ठ + ऊहा = प्रष्ठौहा ॥ In the last example, guna was the substitute required by 6.1.87, the present sutra ordains Vriddhi instead. In the case of एति and एधति, the Vriddhi was debarred by (VI. I. 94): this sutra makes an exception to that rule. The present sutra is an exception to 6.1.94 and not to 6.1.95, because the maxim is पुरस्तादपवादा अनन्तरान् विधीन् बाधन्ते नोत्तरान् \Apavadas that precede the rules which teach operations that have to be superseded by the apavada operations, supersede only those rules that stand nearest to them, not the subsequent rules\. Therefore the present rule does not apply here,:- उप + आ + इत = उप + एत = उपेतः (Here though इ is changed to ए, the rule does not apply). Therefore the form अवैहि is wrong. So also उप + इत = उपेतः for here the root इ has not assumed the form ए, therefore the rule does not apply, the word एचि qualifies the root इ ॥

Vart:- The Vriddhi is the single substitute when अक्ष is followed by ऊहिनी, as अक्षौहिणी सेना ॥

Vart:- The Vriddhi is the single substitute when स्व is followed by ईर or ईरिण, or ईरिणी thus स्वैरम्, स्वैरिणी ॥ The word ईर is formed by the affix घञ् added to ईर्गतौ (Ad. 8 स्वेनाभिप्रायेण ईरणं = स्वैरम् the compounding takes place by 2.1.32. Another form is स्वैरी = स्वेनाभिप्रायेणेरते गच्छति with the affix णिनि 3.2.78.

Vart:- The Vriddhi is the single substitute when प्र is followed by ऊह, ऊढ, ऊढि, एष, एष्य; as प्रौहः, प्रौढः, प्रौढिः, प्रैषः, प्रैष्यः ॥ The word एष is derived from the root इषु 'to wish' (Tudadi. 59), इष् 'to go' (Divadi. 18), and इष् 'to repeat' (Kryadi. 53), by adding the affix घञ्; and the word एष्य is derived from the same roots by adding ण्यत् ॥ This Vartika ordains Vriddhi, while 6.1.94 would have caused पररूपः ॥ While the roots ईष् 'to glean', and ईष् 'to go' 'to injure', 'to show'. (Bhvadi. 115 and 642), form ईषः and ईष्यः with the above affixes; and with प्र, their forms will be प्रेषः and प्रेष्यः ॥

Vart:- The Vriddhi is the single substitute when a word ending in अ is followed by ऋत and forms an Instrumental Tatpurusha compound: as सुखेन ऋतः = सुखार्तः, दुःखेन ऋतः = दुःखार्तः, but सुखेन इतः = सुखेतः ॥ Why in Instrumental? Observe परमर्तः ॥ Why 'Compound'? See सुखेनर्तः ॥

Vart:- The Vriddhi is the single substitute when the word ऋण follows the following:- प्र, वत्सतर, कम्बल, वसन ॥ As प्रार्णम् 'principal debt', वत्सतरार्णम् 'the debt of a steer', कम्बलार्णम् 'debt of a blanket', वसनार्णम् 'debt of a cloth'.

Vart:- So also when the words ऋण and दश are followed by ऋणः — as, ऋणार्णम् and दशार्णम् ॥ The word ऋणार्ण means a debt incurred to pay off a prior debt. The Dasarna_ is the name of a river and of a country.,