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A book of First Class stamps <a href=" http://systemsengineeringresearchlaboratory.org/publications/ ">zenegra sildenafil 50 mg</a> If both sets of points in fact describe the same object, then they can be aligned by rotating one of them around the right axis. For any given pair of points — one from the model and one from the object — it’s possible to calculate the probability that rotating one point by a particular angle around a particular axis will align it with the other. The problem is that the same rotation might move other pairs of points farther away from each other.