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Eduncle Best Answer
Hetu may be contradictory if and only if it is in contradiction something which the proponent has already accepted or is known to hold. Gautama Nyaya-Sutra defines it as: “A certain doctrine (or view) having been accepted the hetu that is contradictory to it is called the viruddha hetuabhasa”. It is also the contradictory hetu,. “Sound is element, because it is caused”, it is viruddha or contradictory middle term. The viruddha or the contradictory middle is that which proved the contradictory of what it is intended to prove, e.g. in “air is heavy because it is empty”, the middle term “empty” actually disproves the heaviness of air.