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+The Yam Yam is one of the most exciting creatures. When it explodes
+(by dropping a rock on it, for example), it can turn to nine new
+elements. Further exploding Yam Yams can turn to other elements, up
+to eight different sets of new elements.
+
+Sometimes the last emerald you are looking for to finish the level
+is hidden in a Yam Yam!