{HEAD ~ The system} includes a three position actuator for moving a valve pin into a closed position in which neither skin nor core flow is permitted, {TAIL ~ a middle position} in which only skin flow is permitted, and an open position in which skin and core flow is permitted 
{ HEAD ~ The system } includes a three position actuator for moving a valve pin into a closed position in which neither skin nor core flow is permitted , { TAIL ~ a middle position } in which only skin flow is permitted , and an open position in which skin and core flow is permitted
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