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    Thanks, got it sorted now

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    @bentaye - Correct. Ambiguity is only allowed in one direction. FYI - Here is my reply to same question from 2 yrs ago

    ... it is ambiguous in both directions (e.g could follow line all around or could go direct to other X). Ambiguity is not allowed.

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    Even when the original post is hidden, you could expand the replies and see the explanation there.

    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?

    It seems so.

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    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?