The extractable material is removed by first dissolving it in a liquid which is not {HEAD ~ a solvent} for {TAIL ~ the matrix forming material} to form a solution 
for
The extractable material is removed by first dissolving it in a liquid which is not { HEAD ~ a solvent } for { TAIL ~ the matrix forming material } to form a solution
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH