-er -ic bbb bbc bbe bbi bbk bbm bbo bbr bbs bbt bcb bcc bce bci bck bcm bco bcr bcs bct be- beb bec bee bei bek bem beo ber bes bet bi- bib bic bie bii bik bim bio bir bis bit bkb bkc bke bkk bkm bko bkr bks bkt bmb bmc bme bmi bmk bmm bmo bmr bms bmt bob boc boe boi bok bom boo bor bos bot brb bre bri brk brm bro brr brs brt bsb bsc bse bsi bsk bsm bso bsr bss bst btb btc bte bti btk btm bto btr bts btt c-- cbb cbc cbe cbi cbk cbm cbo cbr cbs cbt ccb ccc cce cci cck ccm cco ccr ccs cct ce- ceb cec cee cei cek cem ceo cer ces cet ci- cib cic cie cii cik cim cio cir cis cit ckb ckc cki ckm cko cks ckt cmb cmc cme cmi cmk cmm cmo cmr cms cmt co- cob coc coe coi cok com coo cor cos cot crb crc cre cri crk crm cro crr crs crt csb csc cse csi csk csm cso csr css cst ctb ctc cte cti ctk ctm cto ctr cts ctt ebb ebc ebe ebi ebk ebm ebo ebr ebs ebt ec- ecb ecc ece eci eck ecm eco ecr ecs ect eeb eec eee eek eem eeo eer ees eet eib eic eie eii eik eim eio eir eis eit ekb ekc eke eki eko ekr eks ekt em- emb emc eme emi emk emm emo emr ems emt eo- eob eoc eoe eoi eok eom eoo eor eos eot erb erc ere eri erk erm ero err ers ert es- esb esc ese esi esk esm eso esr ess est etb etc ete eti etk etm eto etr ets ett ibb ibc ibe ibi ibk ibm ibo ibr ibs ibt icb icc ice ici ick icm ico icr ics ict ie- iec iee iei iek iem ier ies iet iib iic iie iii iim iio iir iis iit ikb ikc ike iki ikk iko ikr iks ikt im- imb imc ime imi imm imo ims imt io- iob ioc ioe ioi iom ioo ior ios iot ir- irb irc ire iri irk irm iro irr irs irt is- isb isc ise isi isk ism iso isr iss ist itb itc ite iti itk itm ito its itt k-t kbb kbc kbe kbi kbk kbm kbo kbr kbs kcb kcc kce kci kck kcm kcr kcs kct ke- keb kec kee kei kek kem keo ker kes ket kib kic kie kii kik kim kio kir kis kit kkb kkc kke kki kkk kkm kkr kks kkt kmb kmc kme kmi kmk kmm kmo kms kmt kob koc koe koi kok kom koo kor kos kot krc kri krk kro krr krs krt ksb ksc kse ksi ksk ksm kso ksr kss kst ktb ktc kte ktk ktm kto ktr kts ktt m-o m-r mbb mbc mbe mbi mbk mbm mbo mbr mbs mbt mc- mcb mcc mce mci mck mcm mco mcr mcs mct meb mec mee mei mek mem meo mer mes met mi- mib mic mie mii mik mim mio mir mis mit mkb mkc mke mkk mkm mko mkr mks mkt mmb mmc mme mmi mmk mmm mmo mmr mms mmt mob moc moe moi mok mom moo mor mos mot mrb mrc mre mri mrk mrm mro mrr mrs mrt msb msc mse msi msk msm mso msr mss mst mtb mtc mte mti mtk mtm mto mtr mts mtt o-i ob- obb obc obe obi obk obm obo obr obs obt oc- ocb occ oci ock ocm oco ocr ocs oct oeb oec oee oei oem oeo oer oes oet oib oic oie oii oik oim oio oir ois oit okb okc oke oki okk oko okr oks om- omb omc ome omi omm omo omr oms omt oo- oob ooc ooi ook oom ooo oor oos oot or- orb orc ore ori ork orm oro orr ors ort os- osb osc ose osi osk osm oso osr oss ost ot- otb otc ote oti otk otm oto otr ots ott rbb rbc rbe rbi rbk rbm rbo rbr rbs rbt rcb rcc rce rci rcm rco rcr rcs rct re- reb rec ree rei rek rem reo rer res ret rib ric rie rii rik rim rio rir ris rit rkb rkc rke rkk rkm rko rks rkt rmb rmc rme rmi rmm rmo rmr rms rmt rob roc roe roi rok rom roo ror ros rot rrb rrc rri rrk rrm rrr rrs rrt rsb rsc rse rsi rsk rsm rso rsr rss rst rtb rtc rte rti rtk rtm rto rtr rts rtt sbb sbc sbe sbi sbk sbm sbo sbr sbs sbt scb scc sce sci sck scm sco scr scs sct se- seb sec see sei sek sem seo ser ses set sib sic sie sii sik sim sio sir sis sit sk- skb skc ske ski skk skm sko skr sks skt smb smc sme smi smk smm smo smr sms smt sob soc soe soi sok som soo sor sos sot sr- srb src sre sri srk srm sro srr srs srt ss- ssb ssc sse ssi ssk ssm sso ssr sss sst stb stc ste sti stk stm sto str sts stt tbb tbc tbe tbi tbk tbm tbo tbr tbs tbt tcb tcc tce tci tck tcm tco tcr tcs tct te- teb tec tee tei tek tem teo ter tes tet tib tic tie tii tik tim tio tir tis tit tkb tkc tke tkk tkm tko tkr tks tkt tmb tmc tme tmi tmk tmm tmo tmr tms tmt to- tob toc toe toi tok tom too tor tos tot trb trc tre tri trk trm tro trr trs trt tsb tsc tse tsi tsk tsm tso tsr tss tst ttb ttc tte tti ttk ttm tto ttr tts ttt