{HEAD ~ Slots} 50 52 are oriented {TAIL ~ parallel} to one another and are inclined at an acute angle with respect to the horizontal direction 
are oriented
{ HEAD ~ Slots } 50 52 are oriented { TAIL ~ parallel } to one another and are inclined at an acute angle with respect to the horizontal direction
HEAD HEAD HEAD HEAD HEAD OTH OTH REL REL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH