{HEAD ~ The fingers} are movable between a retracted position for insertion into a bag and {TAIL ~ an extended position} in which they can overlap the outer surfaces adjacent to each carton corner 
are movable between
{ HEAD ~ The fingers } are movable between a retracted position for insertion into a bag and { TAIL ~ an extended position } in which they can overlap the outer surfaces adjacent to each carton corner
HEAD HEAD HEAD HEAD HEAD HEAD REL REL REL OTH OTH OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH