Does Mario take the route over the water or does he prefer to go over the grass? Further straight ahead is not possible. The directional sign indicates that he has to choose: either left or right.
Or is it the double arrow from the propositional logic and does the sign want to say something about the equivalence between ... water and grass? W ⇔ G means: if W is true, then G is true, and if G is true, then W is true too. Does this Mario lead to the correct decision?
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