Explanation:

- Section 30: Deals with the confession of one accused person affecting the other accused person by joint trial for the same offense.

- Section 31: States that admissions are not conclusive proof of the matters admitted but may estop.

- Section 22: Concerns the oral admission as to the contents of documents. Generally, oral admissions about documents are not relevant unless the document cannot be produced.

- Section 39: Relates to the relevancy of statements in matters of fact, allowing certain statements to be proved despite being irrelevant.