0MJ - no such command

1MJ - Uppercase Words
 Forces the next (N) word(s) to be uppercase.

2MJ - Lowercase Words
 Forces the next (N) word(s) to be lowercase.

3MJ - Capitalize  Words
 forces the body of the  next (N) word(s) to be lowercase, and the first
 letter of each to be uppercase

4MJ - Negative repeat count
 Gives a negative number  to the next command.

5MJ - Repeat Count.
 Sets the repeat count for the next command  (if it allows one).


6MJ - Self Search
 Causes EDMACS to search for the next occurence of the  second of the
 two keystrokes that invoked this command.