In the second step, the second, {TAIL ~ outer part} 4 is applied to form {HEAD ~ the actual main cap} 3 
In the second step , the second , { TAIL ~ outer part } 4 is applied to form { HEAD ~ the actual main cap } 3
OTH OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH