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