काशिका वृत्ति (आचार्य वामन एवं जयादित्य - अष्टाध्यायी सूत्र-वृत्ति सम्पूर्ण सान्वय सटीक)

न्दोरारुः" - the pratyaya is "आरुः". So: "कर्तृष्वारुप्रत्ययो भवति" or "कर्तृष्वा रुः प्रत्ययो भवति" or "कर्तृष्वाः"? It is clearly intended as: "कर्तृष्वारुः प्रत्ययो भवति ।" Wait, looking closely at the image: 'दिषु कर्तृष्वाः प्रत्ययो भवति' - no, look at the two dots: wait, above the two dots, is there an arch? No, it's just ':', a visarga! Wait, why would there be a visarga after 'ष्वा'? Wait! Look at the letter before the visarga: is it 'ष्वा' or 'ष्वारु'? No, look at: 'क' 'र्तृ' 'ष्वा' ':' - wait, could it be "कर्तृष्वाः"? No, wait! Look at the word: is it "कर्तृष्वा" or "कर्तृषु"? The u-matra on ष is down. But here there is an AA-matra to the right! And a va-phala at the bottom! So it is definitely 'ष्वा'. Then there is a visarga-like mark, or is it 'रुः' where 'रु' is very narrow? Wait, in Devanagari, 'रु' has a rounded back. A colon (:) is just two dots. Here it is literally two