1. BAC BAD CAD
2.COD COE COF COG DOE DOF DOG EOF EOG FOG
3.KSL KSM KSN KSO KSP KSR LSM LSN LSO LSP LSR MSN MSO MSP MSR NSO NSP NSR OSP OSR PSR
1. BAC BAD CAD
2.COD COE COF COG DOE DOF DOG EOF EOG FOG
3.KSL KSM KSN KSO KSP KSR LSM LSN LSO LSP LSR MSN MSO MSP MSR NSO NSP NSR OSP OSR PSR