According to the present invention, {HEAD ~ particle configuration} is represented in terms of a coefficient of {TAIL ~ particle configuration} 
According to the present invention , { HEAD ~ particle configuration } is represented in terms of a coefficient of { TAIL ~ particle configuration }
OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL