Reference for Chullin 152:4

תלתא חוטי הוו חד אלימא ותרי קטיני

Mar son of R'Ashi reports the above in favour of leniency thus: If the thick one was severed [it is permitted, for] there remains the greater number of tendons, and if the thin ones were severed [it is permitted, for] there remains the greater part of its structure.

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