[794] A phenomenon (dhamma) of the formless sphere (arūpāvacara), conjoined with a phenomenon of the formless sphere, arises by root condition (hetu-paccaya): conjoined with one aggregate of the formless sphere, three aggregates [arise]; with two aggregates … rebirth-linking (paṭisandhi).
A phenomenon that is not of the formless sphere, conjoined with a phenomenon that is not of the formless sphere, arises by root condition: conjoined with one aggregate that is not of the formless sphere, three aggregates [arise]; with two aggregates … rebirth-linking.
English translation from the Pali (Siam Raṭṭha edition) — under review, not for citation.