成唯識論述記 8.213

8.213

述曰：自證及證自證為二，見分之餘也。展轉為二緣，互得相緣故，二與見、相分但為增上。

The Commentary states: The svasaṃvittibhāga and the svasaṃvitti-saṃvittibhāga constitute the two, which are the remainder of the darśanabhāga. Mutually viewed, they serve as two conditions, because they can cognize each other; the two serve only as predominant conditions for the darśanabhāga and nimittabhāga.