This third subcollection called The Final Fifty, does not contain fifty suttas, but fifty-two. and it is also divided into five chapters: the Chapter Beginning with Devadha, the Chapter Beginning with One by One, the Chapter Beginning with Cessation, the Chapter on Analysis, and the Chapter on the Six Senses.
Highlights in this subcollection are suttas MN 117 The Great Forty, which is a summary of the Noble Eightfold Path, MN 118 The Instructions for Breathing Practice and MN 121 Brief Discourse on Cessation, which explains the levels of mystical practice. These suttas are the ones that contain the greatest doctrinal content from the Collection of Intermediate Discourses
On the spurious side, the suttas MN 123 stand out, which incorporates with baroque overtones the very late legend of the real origin of the Buddha together with MN 142, which, in addition, serves to provide a falsified doctrinal cover so that it is donated to the bhikkhus in any circumstance. even if they are evil individuals in disguise.