b-p bbb bbc bbn bbo bbp bbr bbs bbt bcb bcc bcn bco bcp bcr bcs bct bnb bnc bnn bno bnp bnr bns bnt bob boc bon boo bop bor bos bot bpb bpc bpn bpo bpp bpr bps bpt brb brn bro brp brr brs brt bsb bsc bsn bso bsp bsr bss bst btb btc btn bto btp btr bts btt c-- cbb cbc cbn cbo cbp cbr cbs cbt ccb ccc ccn cco ccp ccr ccs cct cn- cnb cnc cnn cno cnp cnr cns cnt co- cob coc con coo cop cor cos cot cpb cpc cpn cpo cpp cpr cps cpt crb crc crn cro crp crr crs crt csb csc csn cso csp csr css cst ctb ctc ctn cto ctp ctr cts ctt nbb nbc nbn nbo nbp nbr nbs nbt ncb ncc ncn nco ncp ncr ncs nct nnb nnc nnn nno nnp nns nnt no- nob noc non noo nop nor nos not npb npc npn npo npp npr nps npt nrb nrc nrn nro nrp nrr nrs nrt nsb nsc nsn nso nsp nsr nss nst ntb ntc ntn nto ntp ntr nts ntt ob- obb obc obn obo obp obr obs obt oc- ocb occ ocn oco ocp ocr ocs oct on- onb onc onn ono onp onr ons ont oo- oob ooc oon ooo oop oor oos oot op- opb opc opn opo opp opr ops opt or- orb orc orn oro orp orr ors ort os- osb osc osn oso osp osr oss ost ot- otb otc otn oto otp otr ots ott p-p pbb pbc pbn pbo pbp pbr pbs pbt pcb pcc pcn pco pcp pcr pcs pct pn- pnb pnc pnn pno pnp pnr pns pnt pob poc pon poo pop por pos pot ppb ppc ppn ppo ppp ppr pps ppt prb prc prn pro prp prr prs prt ps- psb psc psn pso psp psr pss pst pt- ptb ptc ptn pto ptp ptr pts ptt rbb rbc rbn rbo rbp rbr rbs rbt rcb rcc rcn rco rcp rcr rcs rct rnb rnc rnn rno rnp rnr rns rnt rob roc ron roo rop ror ros rot rpb rpc rpn rpo rpp rpr rps rpt rrb rrc rrn rrp rrr rrs rrt rsb rsc rsn rso rsp rsr rss rst rtb rtc rtn rto rtp rtr rts rtt sbb sbc sbn sbo sbp sbr sbs sbt scb scc scn sco scp scr scs sct snb snc snn sno snp snr sns snt sob soc son soo sop sor sos sot spb spc spn spo spp spr sps spt sr- srb src srn sro srp srr srs srt ss- ssb ssc ssn sso ssp ssr sss sst stb stc stn sto stp str sts stt tbb tbc tbn tbo tbp tbr tbs tbt tcb tcc tcn tco tcp tcr tcs tct tnb tnc tnn tno tnp tnr tns tnt to- tob toc ton too top tor tos tot tpb tpc tpn tpo tpp tpr tps tpt trb trc trn tro trp trr trs trt tsb tsc tsn tso tsp tsr tss tst ttb ttc ttn tto ttp ttr tts ttt