MessageTree how to get all patterns

Hi I am completing CIS 194 Spring 2013 Homework 2 Exercise 4 where you need to list all of the LogMessages in a MessageTree in order of TimeStamp. I can get the basic patterns of MessageTree but how do I get all of them, it is quite confusing. It is easier to understand if you look at my code and try it out with complex MessageTree. The code is in a file called LogAnalysis.hs and it imports from the file Log.hs. Here is my code: http://ift.tt/2cN7XbR