A Triangle (or a monowave) is the most likely formation to occur in the x-wave po-sition if the last pattern is going to be a Flat with ac-wave Failure.The next best choice for the x-wave would be a monowave (as long as the overall formation is not toocom-plicated). The Complexity Level of the x-wave should be at least the same as the c-wave which preceded it and should be no more complex than the most complex Stan-dard pattem in the entire formation.