It does. The sixes mean "can't do it". The questions are like:
1a Walk 50 feet, 1b Walk 100 feet, 1c Walk 150 feet. So, What happens is if 1abc get (eg.) 1's , do the whole calculation. If 1bc get 6, Don't calculate, =0. If 1a = 1 and 1b=1 but 1c=6, then do a different calculation, which...