I'm surprised people are using a computer for this... The old fashioned way worked just fine for me. Plus you also get a 'feel' for the code that a computer printout of a frequency table just won't give you.
The first thing that clicked into place for me is something that the computer wouldn't have been able to tell me anyway.
The first thing that clicked into place for me is something that the computer wouldn't have been able to tell me anyway.