{HEAD ~ The sliding frames} are provided for {TAIL ~ movement} at an angle of 120 in different directions perpendicular to the pitch, respectively 
{ HEAD ~ The sliding frames } are provided for { TAIL ~ movement } at an angle of 120 in different directions perpendicular to the pitch , respectively
HEAD HEAD HEAD HEAD HEAD HEAD HEAD REL REL REL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH