Retarding {HEAD ~ deposition} of paraffin from {TAIL ~ crude oil} or natural gas with alkaline liquids 
Retarding { HEAD ~ deposition } of paraffin from { TAIL ~ crude oil } or natural gas with alkaline liquids
OTH HEAD HEAD HEAD HEAD HEAD OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH