bbbb bbbs bboy bbyo bcbc bcbs bccc bccs bcos bcsc bcss bobb bobo bobs boby boco bocs boob booc boos bosc boso boss boyo boys bscs bsos bssc byob byoc byos bysb byso byss bysy c-bo cbbc cbbs cbcc cbcs cbsc ccbc cccb cccc cccs ccob ccoc ccss cobb cobo cobs coby coco coob coos cosc coso coss cosy coyo coys cscb cscc csco cscs csob csos csys cybb cybc cybo cyc- cycb cycc cycs cyy- cyyc obbo obby obos oboy obss ocbc occc ocos ocys ooby oooo ooos osby oscc osco osoo osos ossb osso ossy oyss s-os sbbs sbcc sbcs sccc sccs sccy scob scoo scsc scso sobo sobs soco socs socy soos sooy soso soss soyo soys ssby sscc sscs ssoc sssb sssc ssss sybo syco syso syss ybbs yccc ycsb yobo yobs yoso yoyo ysby ysco ysyb yyyy