Although as shown the frame is square or rectangular, this is merely convenient, as long as the resilient member is held solidly within a frame so that it cannot rotate or move with respect to {HEAD ~ the frame}, {TAIL ~ the shape} of the frame is immaterial 
Although as shown the frame is square or rectangular , this is merely convenient , as long as the resilient member is held solidly within a frame so that it can not rotate or move with respect to { HEAD ~ the frame } , { TAIL ~ the shape } of the frame is immaterial
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