Typically, although not necessarily, {HEAD ~ the fiber channels} 103 are disposed between {TAIL ~ the alignment pin channels} 103, 105 on the ferrule end face 
Typically , although not necessarily , { HEAD ~ the fiber channels } 103 are disposed between { TAIL ~ the alignment pin channels } 103 , 105 on the ferrule end face
OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH REL REL REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH