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

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Look at the letter: it is "च्चे" or "त्तु"?
Wait, compare "च्च" in "पुँश्चली" (line 6):
"श्च" has श + च.
Compare "च्च" - does it look like च्च?
Yes, it has a horizontal line and a loop: च्च!
Wait, but is there an 'e' matra on it?
There is a slanting stroke above: च्चे!
Wait, could it be "द्विसकारकनिर्देशाच्च"?
Wait, look at the next word: "तु"!
Why would Kashika say:
"द्विसकारकनिर्देशात्तु पूर्वस्मादेव सूत्रात्..."
Wait! Kashika text on 8.3.6:
Let's check standard Kashika:
"द्विसकारकनिर्देशात्तु पूर्वस्मादेव सूत्रात् स इत्यनुवर्तते ।"
Wait, why is there an extra syllable?
Ah! Look at the image:
"का" "र" "क" "नि" "र्द्दे" "श" "त्ते" "तु"? No, wait:
Could it be: "कारकनिद्देशात्ते तु"?
Wait, look at "नि": न + इ.
Then: र्द्दे - र् + द् + द + े!
Then: श (sha) with ा (aa): शा.
Then: त् + त with ु: त्तु?
Wait, look above it: there is a