RF_C
RF_AC = (RF_A | RF_C),
RF_BC = (RF_B | RF_C),
RF_CD = (RF_C | RF_D),
RF_ABC = (RF_A | RF_B | RF_C),
RF_ACD = (RF_A | RF_C | RF_D),
RF_BCD = (RF_B | RF_C | RF_D),
RF_ABCD = (RF_A | RF_B | RF_C | RF_D),