b-u bbb bbc bbn bbo bbs bbu bby bcb bcc bcn bco bcs bcu bcy bnb bnc bnn bno bns bnu bob boc bon boo bos bou boy bsb bsc bsn bso bss bsu bsy bub buc bun buo bus buu buy by- byc byn byo bys byu c-- cbb cbc cbn cbo cbs cbu cby ccb ccc ccn cco ccs ccu cn- cnb cnc cnn cno cns cnu cny co- cob coc con coo cos cou coy csb csc csn cso css csu csy cub cuc cun cuo cus cuu cuy cyb cyc cyn cyo cys nbb nbc nbn nbo nbs nbu ncb ncc ncn nco ncs ncu nnb nnc nnn nno nns nnu no- nob noc non noo nos nou noy nsb nsc nsn nso nss nsu nsy nub nuc nun nuo nus nuu nuy nyc nyn nyo nys nyu nyy ob- obb obc obn obo obs obu oby oc- ocb occ ocn oco ocs ocu on- onb onc onn ono ons onu ony oo- oob ooc oon ooo oos os- osb osc osn oso oss osu ou- ouc oun ouo ous oyo oys sbb sbc sbn sbo sbs sbu sby scb scc scn sco scs scu snb snc snn sno sns snu sny sob soc son soo sos sou soy ss- ssb ssc ssn sso sss ssu sub suc sun suo sus suu suy sy- syb syc syn sys syu ubb ubc ubn ubo ubs ubu uby ucb ucc ucn uco ucs ucu un- unb unc unn uno uns unu uny uob uoc uon uoo uos usb usc usn uso uss usu uuc uun uus uuu uyc uyo uys uyu ybc ybs yby ycc yco ycs ycu ycy ynn yns ynu yny yob yoc yon yoo yos you yoy ysb ysc yso yss ysu ysy yun yuo yus yuu yuy yyb yyc yys yyu yyy