Lexicographically sorted list of lists of strings

Question

Currently, I am trying to implement a code to generate frequent sequences. In doing so I need to get an in-place sort of a list of lists of strings as follows:

Answer 1

You can also use

myList = myList.OrderBy(arr => arr[0])
                .ThenBy(arr => arr[1])
                .ThenBy(arr => arr[2])
                .ToList();