What is the total number of hetvabhasa, the fallacies of inference, in Nyaya?

The number of hetvabhasa, the fallacies of inference, in Nyaya is five.

They are savyabhichara, viruddha, satpratipaksha, asiddha, and badhita.

Each names a way in which a proposed reason fails to be a genuine hetu.

The erratic, the contradictory, the counterbalanced, the unproved, and the sublated.

All five defects vitiate an inference by corrupting its middle term.