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