b-p bbb bbc bbk bbo bbp bbs bby bcb bcc bck bco bcp bcs bcy bkb bkc bkk bko bkp bks bob boc bok boo bop bos boy bpb bpc bpo bpp bps bpy bsb bsc bsk bso bsp bss bsy by- byc byk byo byp bys c-- cbb cbc cbk cbo cbp cbs cby ccb ccc cck cco ccp ccs ckb ckc cko cks cky co- cob coc cok coo cop cos coy cpb cpc cpk cpo cpp cps csb csc csk cso csp css csy cyb cyc cyk cyo cyp cys kbb kbc kbk kbo kbp kbs kcb kcc kck kcp kcs kkb kkc kkk kkp kks kky kob koc kok koo kop kos koy kpc kpk kpo kpp kps ksb ksc ksk kso ksp kss kyc kyo kyp kys ob- obb obc obk obo obp obs oby oc- ocb occ ock oco ocp ocs okb okc okk oko okp oks oo- oob ooc ook ooo oop oos op- opb opc opk opo opp ops opy os- osb osc osk oso osp oss oyo oys p-p pbb pbc pbk pbo pbp pbs pby pcb pcc pck pco pcp pcs pkb pkc pko pkp pks pky pob poc pok poo pop pos poy ppb ppc ppk ppo ppp pps ps- psb psc psk pso psp pss psy py- pyb pyc pyk pyo pys sbb sbc sbk sbo sbp sbs sby scb scc sck sco scp scs sk- skb skc skk sko skp sks sky sob soc sok soo sop sos soy spb spc spk spo spp sps spy ss- ssb ssc ssk sso ssp sss sy- syb syc syk syp sys ybc ybp ybs yby ycc yco ycp ycs ycy ykk yob yoc yok yoo yop yos yoy ypo yps ysb ysc ysk yso ysp yss ysy yyb yyc yys yyy