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

How about :

myList = myList.OrderBy(s => string.Join(string.Empty, s)).ToList();

The trick is to sort according to the string made by the concatenation of each element of the child list.