If necessary, the bonding position is infixed&colon; CHCHCHNH propan-1-amine, CHCHNHCH propan-2-amine. Biggs calls this "infixed reduplication". A reduplication of the final consonant of the root is being infixed to the root. Transitive verbs with pronominal objects take infixed object markers. Direct object personal pronouns are infixed between the preverb and the verbal stem. Personal pronouns as direct objects are infixed between the preverb and the verbal stem. "nu" is also used as a negation adverb, infixed between subject and verb. The verbal prefix <um>, is inserted, or "infixed", to the first syllable of the root. Verb classifications are intensive-conative, causative, reflexive (with infixed "-t-"), and causative-reflexive. The infixed pronouns belong to three classes, conventionally labelled A, B, and C.