Hetusahetukaduka

Abhidhammapiṭaka · Paṭṭhāna (3) · Vol. 42 · Section 117

[117] A phenomenon (dhamma) that is both a root and accompanied by roots is a condition, by repetition condition (āsevana-paccaya), for a phenomenon that is both a root and accompanied by roots: similar to the proximity condition (anantara-paccaya).

English translation from the Pali (Siam Raṭṭha edition) — under review, not for citation.

This passage also appears in 2 other places

Vol. 42 · Section 88 — Sahetukaduka
Vol. 42 · Section 25 — Hetuduka