{HEAD ~ The groove} 150 and the slider member 152 together operate in conjunction to provide {TAIL ~ a linear bearing} such that the carriage member 148, the slider member 152, and the reflective surfaces 72 and 74 move in the lineal direction 154 
{ HEAD ~ The groove } 150 and the slider member 152 together operate in conjunction to provide { TAIL ~ a linear bearing } such that the carriage member 148 , the slider member 152 , and the reflective surfaces 72 and 74 move in the lineal direction 154
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