This case has been addressed in a post below, but the answer is hidden
X-----+
X |
| |
| |
+-----+
I do not understand why this is not valid?
There is only one valid path using all the signs.
Going directly from X to X is not valid as it does not use all the signs.
EDIT: I think I understood, the fact that there is a choice to go right or down at the beginning makes it anbiguous so invalid. Is that correct?
Thanks, got it sorted now
@bentaye - Correct. Ambiguity is only allowed in one direction. FYI - Here is my reply to same question from 2 yrs ago
Even when the original post is hidden, you could expand the replies and see the explanation there.
It seems so.
This case has been addressed in a post below, but the answer is hidden
I do not understand why this is not valid?
There is only one valid path using all the signs.
Going directly from X to X is not valid as it does not use all the signs.
EDIT: I think I understood, the fact that there is a choice to go right or down at the beginning makes it anbiguous so invalid. Is that correct?