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