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