b-p bbb bbc bbo bbp bby bcb bcc bco bcp bcy bcz bob boc boo bop boy boz bpb bpc bpo bpp bpy by- byc byo byp byz bzo bzp bzz c-- cbb cbc cbo cbp cby cbz ccb ccc cco ccp ccz co- cob coc coo cop coy coz cpb cpc cpo cpp cpz cyb cyc cyo cyp cz- czc czo ob- obb obc obo obp oby oc- ocb occ oco ocp ocz oo- oob ooc ooo oop op- opb opc opo opp opy oyo ozo ozz p-p pbb pbc pbo pbp pby pbz pcb pcc pco pcp pob poc poo pop poy poz ppb ppc ppo ppp ppz py- pyb pyc pyo pzc pzp ybc ybp yby ybz ycc yco ycp ycy yob yoc yoo yop yoy ypo yyb yyc yyy yyz yzb yzy zbb zbc zby zco zo- zob zoc zoo zpc zpo zpp zzy zzz