This is considered to be the reason why {HEAD ~ a large dot} is formed in {TAIL ~ a short time} 
is formed in
This is considered to be the reason why { HEAD ~ a large dot } is formed in { TAIL ~ a short time }
OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD REL REL REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL