////6. Now you have two more notes to work with. Pick the B (although you don't have to) and follow its line to the 10 o'clock position. What notes flank that position? The two notes that flank B which are C (already filled in) and Bb. So put Bb at the 10 o'clock position.////

I wrote this in the opening post but it is in error. No doubt, some of you caught it. If you follow B across to the opposite side of the circle, you end up at the 11 o'clock position and not the 10 o'clock position. Sorry if that caused any confusion.