A first portion of the pressurized fluid is directed downwardly for impringement upon the material being drilled to pick up and remove dust and {HEAD ~ cuttings} from {TAIL ~ the vicinity} of the cutting cones 
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A first portion of the pressurized fluid is directed downwardly for impringement upon the material being drilled to pick up and remove dust and { HEAD ~ cuttings } from { TAIL ~ the vicinity } of the cutting cones
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH