Whilst I am sorry that your friend did not manage to crack the code, C, I am somewhat relieved that it is not just me! I have been a shorthand writer for over 40 years and at one time used to take verbatim shorthand. Although now very rusty speed-wise, I still use shorthand to make notes for myself at meetings etc, so it continues to be of use to me.
So it is frustrating to see what looks like nice, neat Pitman and find it is totally beyond me. I have spent far too long looking at it now, thinking that if I try from another angle.... which is probably what your friend is doing now!
Regards
Greensleeves