俱舍論疏 9.220

9.220

論「又為顯示親傳二緣至諸行方生」，第四明親傳二緣相待決定。已上並是論主釋也。

The treatise says: "Furthermore, to show that through both direct and indirect conditions [are formations born]." The fourth point clarifies that direct and indirect conditions are determinately interdependent. All the above are the treatise master's own explanations.