A group of three suttas. Sāriputta und Moggallāna go to Anuruddha und ask him various questions. Anuruddha says that the four satipatthānas should be attained both by the sekha und the asekha (the learner und the adept), und declares that he himself came to understand the tausend-fold world-system by developing these four. S.v.298f.