bbbb bbbs bbfc bcbc bcbs bccc bccs bcfc bcof bcos bcsc bcss bfcs bffs bobb bobo bobs boco bocs boff bofs boob booc boof boos bosc boso boss bscs bsfc bsff bsfs bsos bssc c-bo cbbc cbbs cbcc cbcs cbfb cbfc cbsc ccbc cccb cccc cccf cccs ccfc ccff ccob ccoc ccsf ccss cfbc cfbs cfcb cfcf cfco cfcs cffb cfos cobb cobo cobs coco cofc coff cofs coob coof coos cosc coso coss csbf cscb cscc cscf csco cscs csfc csob csos fcbs fccf fcsc ffcc ffff ffss fobs foco focs fofo foof foos fosb foso foss fscb fscc fsfo fssc fssf obbo obos obss ocbc occc ocos off- offc offo offs ooff oofs oooo ooos oscc osco osoo osos ossb osso s-os sbbs sbcc sbcs sbfc sccc sccs scfc scob scoo scsc scso sfbc sfcc sfco sfcs sffc sfos sfss sobo sobs soco socs sofo soof soos soso soss sscc sscs ssfc ssoc sssb sssc sssf ssss