Wow....you caught an error in the pattern. Thank you for asking. If you look at the threading on page 3 you will see that when I repeated the 5 A's....they were threaded 121214, x4 and when I repeated the C's they were 141412 x4
So page 4 should read
A-1212 (add a 1 and a 4 between repeats)
C-1414 (add a 1 and a 2 between repeats)
I do go over this in the video so that's probably why no one has let me know...and folks have just been threading directly from page 3 which is correct, yay!. Great catch. Have you watched the episode yet? I'll get the pdf changed.