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zeSAt kartari parasmaipadam

शेषात्कर्तरि परस्मैपदम् ONPANINI 13078

Otherwise use flat when showing the doer.

Use flat if no sUtra says you should use bent.

pacaty odanan devadattaH पचत्योदनं देवदत्तः

Isn't the kartari कर्तरि ("when showing the doer") redundant here? — we are inheriting it from kartarikarm... anyway.

You are at least 99.99% right there. Candravasu, however, says that two Rongs make a Write — this apparently redundant kartari कर्तरि means "when PROPERLY showing the doer", thusly making the /karmakartari

pacyata:: odanas svayam eva पच्यत‌ ओदनः स्वयमेव

get /Atmanepada. ISO the fact that technically we might say that the /laT in **pacyate पच्यते here is showing the doer and showing the object at the same time.

If you didn't understand a word of all that, I'll rephrase. The theory is that when /pANini appears to be doing something redundant, he's telling us that there is a hidden cat somewhere, and the student that likes puzzles might wish to amuse himself figuring out where. Candravasu got from /kAzikA the idea that this kartari कर्तरि here explains why the /karmakartari gets /yak ISO no rules teaching so.

My personal guess is that /pANini just never thought about the /karmakartari and the kartari कर्तरि here is redundant.

Anyway, we have a proverb here — when the devil gets bored, he kills flies with his tail.