俱舍論頌疏論本 28.71

28.71

釋曰：二類定者，謂本善等至分為二類：一者有漏、二者無漏。往上名順，還下名逆，同類名均，異類名間，相隣名次，越一名超。

The explanation says: 'The two types of absorptions' means that the fundamental wholesome samāpattis are divided into two types: first, defiled (sāsrava); second, undefiled (anāsrava). Going upward is called 'direct'; returning downward is called 'reverse.' Being of the same type is called 'uniform'; being of different types is called 'alternating.' Being contiguous is called 'successive'; jumping over one is called 'skipped.'