combinational one controllability (CC1) combinational observability (CO) sequential zero controllability (SC0) sequential one controllability (SC1) sequential observability (SO) combinational zero controllability (CC0) Primary Inputs: The combinational controllabilities (CC0 & CC1) are set to ‘1’ and all sequential controllabilities (SC0 & SC1) are set to ‘0’ Primary Outputs: Both combinational and sequential observabilities are set to ‘0’