{HEAD ~ The step} of washing the aqueous suspension may be carried out by washing with an aqueous solution containing {TAIL ~ an organic surfactant} 
{ HEAD ~ The step } of washing the aqueous suspension may be carried out by washing with an aqueous solution containing { TAIL ~ an organic surfactant }
HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL TAIL