b-p bbb bbc bbn bbo bbp bbr bbs bby bcb bcc bcn bco bcp bcr bcs bcy bnb bnc bnn bno bnp bnr bns bob boc bon boo bop bor bos boy bpb bpc bpn bpo bpp bpr bps bpy brb brn bro brp brr brs bry bsb bsc bsn bso bsp bsr bss bsy by- byc byn byo byp byr bys c-- cbb cbc cbn cbo cbp cbr cbs cby ccb ccc ccn cco ccp ccr ccs cn- cnb cnc cnn cno cnp cnr cns cny co- cob coc con coo cop cor cos coy cpb cpc cpn cpo cpp cpr cps crb crc crn cro crp crr crs cry csb csc csn cso csp csr css csy cyb cyc cyn cyo cyp cyr cys nbb nbc nbn nbo nbp nbr nbs ncb ncc ncn nco ncp ncr ncs nnb nnc nnn nno nnp nns no- nob noc non noo nop nor nos noy npb npc npn npo npp npr nps nrb nrc nrn nro nrp nrr nrs nry nsb nsc nsn nso nsp nsr nss nsy nyc nyn nyo nyp nys nyy ob- obb obc obn obo obp obr obs oby oc- ocb occ ocn oco ocp ocr ocs on- onb onc onn ono onp onr ons ony oo- oob ooc oon ooo oop oor oos op- opb opc opn opo opp opr ops opy or- orb orc orn oro orp orr ors ory os- osb osc osn oso osp osr oss oyo oys p-p pbb pbc pbn pbo pbp pbr pbs pby pcb pcc pcn pco pcp pcr pcs pn- pnb pnc pnn pno pnp pnr pns pny pob poc pon poo pop por pos poy ppb ppc ppn ppo ppp ppr pps prb prc prn pro prp prr prs pry ps- psb psc psn pso psp psr pss psy py- pyb pyc pyn pyo pyr pys rbb rbc rbn rbo rbp rbr rbs rcb rcc rcn rco rcp rcr rcs rnb rnc rnn rno rnp rnr rns rny rob roc ron roo rop ror ros roy rpb rpc rpn rpo rpp rpr rps rrb rrc rrn rrp rrr rrs rsb rsc rsn rso rsp rsr rss ry- ryc ryn ryo ryr rys ryy sbb sbc sbn sbo sbp sbr sbs sby scb scc scn sco scp scr scs snb snc snn sno snp snr sns sny sob soc son soo sop sor sos soy spb spc spn spo spp spr sps spy sr- srb src srn sro srp srr srs sry ss- ssb ssc ssn sso ssp ssr sss sy- syb syc syn syp syr sys ybc ybp ybr ybs yby ycc yco ycp ycs ycy ynn ynp yns yny yob yoc yon yoo yop yor yos yoy ypo yps yrc yrn yro yrp yrs ysb ysc yso ysp ysr yss ysy yyb yyc yys yyy