If this helps... From, A Killing Art: The Untold History of Tae Kwon Do (by Alex Gillis, available from Amazon.com, including Kindle format)
As if to highlight this, Choi designed the Ju-Che pattern to be the most difficult out of the twenty-four, demanding a jumping split-kick and two techniques that were supposed to stop momentarily in mid-air, as if the attacker were floating...
I really liked Gillis' book and thought it made some much needed information available to people. Comments like the one above, however, leave much to be desired.
Ditto on much needed info. However there were numerous instances where he made rash generalizations based on limited observations. My opinion is based on personal experience where I came away with an incorrect idea after one eperience with General Choi but the concept he was trying to convey became more clear after subsequent encounters. Have spoke to many others who also encountered this. Some concepts are not easily communicated.