[716] A phenomenon (dhamma) accompanied by equanimity (upekkhāsahagata) is a condition for a phenomenon accompanied by equanimity by way of object condition (ārammaṇa-paccaya). … is a condition by way of predominance condition (adhipati-paccaya).
Just as in the with-rapture dyad (sappītika-duka), so both the object [condition] and the predominance [condition] should be elaborated in detail; the difference is [the term] "equanimity."
English translation from the Pali (Siam Raṭṭha edition) — under review, not for citation.