A.FH=full holeB.IF=internal flushC.REG=regularD.RIH=Run in hole
A.IF=internal flush FH=full hole REG=regularB.IF=internal flat FH=full hole REG=regularC.IF=internal flush FH=fill hole REG=regularD.IF=internal flat FH=fill hole REG=regular
A.IFB.FHC.REGD.RIH