-er bbb bbe bbk bbm bbn bbo bbr bbs bbt be- beb bee bek bem ben beo ber bes bet bkb bke bkk bkm bkn bko bkr bks bkt bmb bme bmk bmm bmn bmo bmr bms bmt bnb bne bnk bnn bno bnr bns bnt bob boe bok bom bon boo bor bos bot brb bre brk brm brn bro brr brs brt bsb bse bsk bsm bsn bso bsr bss bst btb bte btk btm btn bto btr bts btt ebb ebe ebk ebm ebn ebo ebr ebs ebt eeb eee eek eem een eeo eer ees eet ekb eke eko ekr eks ekt em- emb eme emk emm emn emo emr ems emt en- enb ene enk enm enn eno enr ens ent eo- eob eoe eok eom eon eoo eor eos eot erb ere erk erm ern ero err ers ert es- esb ese esk esm esn eso esr ess est etb ete etk etm etn eto etr ets ett k-t kbb kbe kbk kbm kbn kbo kbr kbs ke- keb kee kek kem ken keo ker kes ket kkb kke kkk kkm kkn kkr kks kkt kmb kme kmk kmm kmo kms kmt kn- kne knk knm knn kno knr knt kob koe kok kom kon koo kor kos kot krk krn kro krr krs krt ksb kse ksk ksm ksn kso ksr kss kst ktb kte ktk ktm ktn kto ktr kts ktt m-o m-r mbb mbe mbk mbm mbo mbr mbs mbt meb mee mek mem men meo mer mes met mkb mke mkk mkm mkn mko mkr mks mkt mmb mme mmk mmm mmn mmo mmr mms mmt mnb mne mnk mnm mnn mno mnr mns mnt mob moe mok mom mon moo mor mos mot mrb mre mrk mrm mrn mro mrr mrs mrt msb mse msk msm msn mso msr mss mst mtb mte mtk mtm mtn mto mtr mts mtt nbb nbe nbk nbm nbn nbo nbr nbs nbt ne- neb nee nek nem nen neo ner nes net nke nkk nkm nkn nko nkr nks nkt nmb nme nmk nmm nmn nmo nmr nms nmt nnb nne nnk nnm nnn nno nns nnt no- nob noe nok nom non noo nor nos not nrb nre nrk nrm nrn nro nrr nrs nrt nsb nse nsk nsm nsn nso nsr nss nst ntb nte ntk ntm ntn nto ntr nts ntt ob- obb obe obk obm obn obo obr obs obt oeb oee oem oen oeo oer oes oet okb oke okk oko okr oks om- omb ome omm omn omo omr oms omt on- onb one onk onn ono onr ons ont oo- oob ook oom oon ooo oor oos oot or- orb ore ork orm orn oro orr ors ort os- osb ose osk osm osn oso osr oss ost ot- otb ote otk otm otn oto otr ots ott rbb rbe rbk rbm rbn rbo rbr rbs rbt re- reb ree rek rem ren reo rer res ret rkb rke rkk rkm rko rks rkt rmb rme rmm rmn rmo rmr rms rmt rnb rnm rnn rno rnr rns rnt rob roe rok rom ron roo ror ros rot rrb rrk rrm rrn rrr rrs rrt rsb rse rsk rsm rsn rso rsr rss rst rtb rte rtk rtm rtn rto rtr rts rtt sbb sbe sbk sbm sbn sbo sbr sbs sbt se- seb see sek sem sen seo ser ses set sk- skb ske skk skm sko skr sks skt smb sme smk smm smn smo smr sms smt snb sne snk snm snn sno snr sns snt sob soe sok som son soo sor sos sot sr- srb sre srk srm srn sro srr srs srt ss- ssb sse ssk ssm ssn sso ssr sss sst stb ste stk stm stn sto str sts stt tbb tbe tbk tbm tbn tbo tbr tbs tbt te- teb tee tek tem ten teo ter tes tet tkb tke tkk tkm tko tkr tks tkt tmb tme tmk tmm tmn tmo tmr tms tmt tnb tne tnk tnm tnn tno tnr tns tnt to- tob toe tok tom ton too tor tos tot trb tre trk trm trn tro trr trs trt tsb tse tsk tsm tsn tso tsr tss tst ttb tte ttk ttm ttn tto ttr tts ttt