Gert, you may be right. Putting it like that, I think I now understand.
But then, why was I given full marks for my answer??
For all my written assignment I was marked 100%. Including questions I half completed.
0 is divisible by 6 so a word with length 0 is not acceptable. This means that the start state should not be an end state as well. If it was marked as correct in your ass solution, it was a mistake that the marker overlooked.