{HEAD ~ a motion device} for effecting {TAIL ~ relative movement} between said carriage and a friction surface in a first direction 
{ HEAD ~ a motion device } for effecting { TAIL ~ relative movement } between said carriage and a friction surface in a first direction
HEAD HEAD HEAD HEAD HEAD HEAD HEAD REL REL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH