[1745] An unfixed phenomenon (aniyata dhamma) is a condition for an unfixed phenomenon by presence condition (atthi-paccaya): conascent (sahajāta), prenascent (purejāta), postnascent (pacchājāta), nutriment (āhāra), faculty (indriya).
Conascent: one unfixed aggregate (khandha) is a condition for the three aggregates and for the mind-originated forms (cittasamuṭṭhāna-rūpa) by presence condition; two aggregates … At the moment of rebirth-linking (paṭisandhi), the aggregates are a condition for the base (vatthu) by presence condition; the base is a condition for the aggregates by presence condition; one great element (mahābhūta) … for the non-percipient beings (asaññasattā), one great element … .
Prenascent: One contemplates with insight the eye … the base as impermanent, as suffering (dukkha), as non-self; one relishes it and delights in it; with that as object, lust (rāga) arises, grief (domanassa) arises. One sees a form with the divine eye; one hears a sound with the divine ear element (sotadhātu). The form base (rūpāyatana) is (a condition) for eye-consciousness (cakkhuviññāṇa), the tangible base for body-consciousness, the eye base for eye-consciousness, the body base for body-consciousness; the base is a condition for the unfixed aggregates by presence condition.
Postnascent: the unfixed aggregates are a condition for this prenascent body by presence condition.
Edible nutriment (kabaḷīkāra āhāra) is a condition for this body by presence condition.
The material life-faculty (rūpa-jīvitindriya) is a condition for the kamma-born forms (kaṭattā-rūpa) by presence condition.
English translation from the Pali (Siam Raṭṭha edition) — under review, not for citation.