{HEAD ~ The streams} can, more or less, contain equal parts of {TAIL ~ each component} and are used without further processing or purification 
{ HEAD ~ The streams } can , more or less , contain equal parts of { TAIL ~ each component } and are used without further processing or purification
HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH