There then follows {HEAD ~ separation V2} of {TAIL ~ a first raw sand fraction} RS1, using a sifting device SE1, which has a size of hole in the range of, e.g., 10 12 mm 
There then follows { HEAD ~ separation V2 } of { TAIL ~ a first raw sand fraction } RS1 , using a sifting device SE1 , which has a size of hole in the range of , e.g. , 10 12 mm
OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH