[1738] An unfixed phenomenon (aniyata dhamma) is a condition for an unfixed phenomenon by dissociation condition (vippayutta-paccaya): conascent, prenascent, postnascent.
Conascent: unfixed aggregates (khandhā) are a condition, by dissociation condition, for forms (rūpa) originated by mind (citta); at the moment of rebirth-linking, the aggregates are a condition for the base (vatthu) by dissociation condition; the base is a condition for the aggregates by dissociation condition.
Prenascent: the eye base (cakkhāyatana) [is a condition] for eye-consciousness (cakkhuviññāṇa), the body base (kāyāyatana) for body-consciousness (kāyaviññāṇa); the base is a condition for the unfixed aggregates by dissociation condition.
Postnascent: unfixed aggregates are a condition for this prenascent body by dissociation condition.
English translation from the Pali (Siam Raṭṭha edition) — under review, not for citation.