One or more mud pump 10 pump mud from the pits through the fill line 12 and into {HEAD ~ the interior} of {TAIL ~ the drill pipe} DP 
One or more mud pump 10 pump mud from the pits through the fill line 12 and into { HEAD ~ the interior } of { TAIL ~ the drill pipe } DP
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH