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