bbb bbc bbn bbo bbs bby bcb bcc bcn bco bcs bcy bcz bnb bnc bnn bno bns bnz bob boc bon boo bos boy boz bsb bsc bsn bso bss bsy by- byc byn byo bys byz bzn bzo bzs bzz c-- cbb cbc cbn cbo cbs cby cbz ccb ccc ccn cco ccs ccz cn- cnb cnc cnn cno cns cny co- cob coc con coo cos coy coz csb csc csn cso css csy csz cyb cyc cyn cyo cys cz- czc czo nbb nbc nbn nbo nbs ncb ncc ncn nco ncs nnb nnc nnn nno nns nnz no- nob noc non noo nos noy noz nsb nsc nsn nso nss nsy nsz nyc nyn nyo nys nyy nzb nzo nzs nzz ob- obb obc obn obo obs oby oc- ocb occ ocn oco ocs ocz on- onb onc onn ono ons ony oo- oob ooc oon ooo oos os- osb osc osn oso oss oyo oys ozo ozs ozz sbb sbc sbn sbo sbs sby scb scc scn sco scs snb snc snn sno sns sny sob soc son soo sos soy soz ss- ssb ssc ssn sso sss ssz sy- syb syc syn sys ybc ybs yby ybz ycc yco ycs ycy ynn yns yny yob yoc yon yoo yos yoy ysb ysc yso yss ysy ysz yyb yyc yys yyy yyz yzb yzy zbb zbc zbs zby zco zcs znc znn zno zns zo- zob zoc zon zoo zos zsz zzs zzy zzz