b-u bbb bbc bbo bbu bby bcb bcc bco bcu bcy bcz bob boc boo bou boy boz bub buc buo buu buy buz by- byc byo byu byz bzo bzu bzz c-- cbb cbc cbo cbu cby cbz ccb ccc cco ccu ccz co- cob coc coo cou coy coz cub cuc cuo cuu cuy cuz cyb cyc cyo cz- czc czo ob- obb obc obo obu oby oc- ocb occ oco ocu ocz oo- oob ooc ooo ou- ouc ouo oyo ozo ozu ozz ubb ubc ubo ubu uby ucb ucc uco ucu uob uoc uoo uuc uuu uyc uyo uyu uzb uzo uzu ybc yby ybz ycc yco ycu ycy yob yoc yoo you yoy yuo yuu yuy yyb yyc yyu yyy yyz yzb yzu yzy zbb zbc zby zco zo- zob zoc zoo zou zub zuc zuz zzy zzz