In the case where one or more secondary arrays of cutters are provided, each secondary array may also comprise cutters spaced circumferentially apart around the central axis of {TAIL ~ rotation} of {HEAD ~ the drill bit} and having cutting edges disposed at substantially the same radial distance from said axis 
In the case where one or more secondary arrays of cutters are provided , each secondary array may also comprise cutters spaced circumferentially apart around the central axis of { TAIL ~ rotation } of { HEAD ~ the drill bit } and having cutting edges disposed at substantially the same radial distance from said axis
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH