wherein {HEAD ~ the first plurality} of {TAIL ~ particles} is mixed with a second plurality of non encased particles, and 
of
wherein { HEAD ~ the first plurality } of { TAIL ~ particles } is mixed with a second plurality of non encased particles , and
OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH