The asphalt cross linking {HEAD ~ agent blend comprises} a second asphalt and {TAIL ~ at least one cross} linking agent 
The asphalt cross linking { HEAD ~ agent blend comprises } a second asphalt and { TAIL ~ at least one cross } linking agent
OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH