-er a-a a-b a-c a-t aaa aab aac aae aag aak aao aap aar aas aat ab- aba abb abc abe abg abk abo abp abr abs abt ac- aca acb acc ace acg ack aco acp acr acs act aea aeb aec aee aeg aek aeo aep aer aes aet ag- aga agb agc age agg agk ago agp agr ags agt aka akb akc ake akg akk ako akp akr aks aoa aob aoc aoe aog aok aoo aop aor aos aot ap- apa apb apc ape apg apk apo app apr aps apt ar- ara arb arc are arg ark aro arp arr ars art as- asa asb asc ase asg ask aso asp asr ass ast at- ata atb atc ate atg ato atp atr ats att b-p baa bab bac bae bag bak bao bap bar bas bat bba bbb bbc bbe bbg bbk bbo bbp bbr bbs bbt bca bcb bcc bce bcg bck bco bcp bcr bcs bct be- bea beb bec bee beg bek beo bep ber bes bet bga bgb bgc bge bgg bgk bgo bgp bgr bgs bgt bka bkb bkc bke bkg bkk bko bkp bkr bks bkt boa bob boc boe bog bok boo bop bor bos bot bpa bpb bpc bpe bpg bpo bpp bpr bps bpt bra brb bre brg brk bro brp brr brs brt bsa bsb bsc bse bsg bsk bso bsp bsr bss bst bta btb btc bte btg btk bto btp btr bts btt c-- caa cab cac cae cag cak cao cap car cas cat cba cbb cbc cbe cbg cbk cbo cbp cbr cbs cbt cca ccb ccc cce ccg cck cco ccp ccr ccs cct ce- cea ceb cec cee ceg cek ceo cep cer ces cet cga cgb cgc cge cgg cgo cgp cgr cgs cgt cka ckb ckc cko cks ckt co- coa cob coc coe cog cok coo cop cor cos cot cpa cpb cpc cpe cpg cpk cpo cpp cpr cps cpt cra crb crc cre crg crk cro crp crr crs crt csa csb csc cse csg csk cso csp csr css cst cta ctb ctc cte ctg ctk cto ctp ctr cts ctt eaa eab eac eae eag eak eao eap ear eas eat eba ebb ebc ebe ebg ebk ebo ebp ebr ebs ebt ec- eca ecb ecc ece ecg eck eco ecr ecs ect eea eeb eec eee eeg eek eeo eep eer ees eet ega egb egc ege egg ego egp egr egs egt eka ekb ekc eke ekg eko ekp ekr eks ekt eo- eoa eob eoc eoe eog eok eoo eop eor eos eot ep- epa epb epc epe epg epo epp epr eps ept era erb erc ere erg erk ero erp err ers ert es- esa esb esc ese esg esk eso esp esr ess est eta etb etc ete etg etk eto etp etr ets ett g-p gaa gab gac gae gag gak gao gap gar gas gat gba gbc gbe gbg gbk gbo gbp gbr gbs gbt gca gcb gcc gce gcg gck gco gcp gcr gcs gct ge- gea geb gec gee geg gek geo gep ger ges get gga ggb ggc ggg ggo ggp ggr ggs ggt gka gkb gko gkp gks gkt goa gob goc goe gog gok goo gop gor gos got gpa gpb gpc gpe gpg gpk gpo gpp gpr gps gpt gra grb grc gre grg grk gro grp grr grs grt gsa gsb gsc gse gsg gsk gso gsp gsr gss gst gta gtb gtc gte gtg gtk gto gtp gtr gts gtt k-t ka- kaa kab kac kae kag kak kao kap kar kas kat kba kbb kbc kbe kbk kbo kbp kbr kbs kca kcb kcc kce kcg kck kcp kcr kcs kct ke- kea keb kec kee keg kek keo kep ker kes ket kga kgb kgc kgo kgp kgs kkb kkc kke kkk kkp kkr kks kkt koa kob koc koe kog kok koo kop kor kos kot kpa kpc kpe kpk kpo kpp kpr kps kpt kra krc krg krk kro krp krr krs krt ksa ksb ksc kse ksg ksk kso ksp ksr kss kst kta ktb ktc kte ktg ktk kto ktp ktr kts ktt oaa oab oac oae oag oak oao oap oar oas oat ob- oba obb obc obe obg obk obo obp obr obs obt oc- oca ocb occ ocg ock oco ocp ocr ocs oct oea oeb oec oee oeg oeo oep oer oes oet oga ogc oge ogg ogo ogp ogs ogt oka okb okc oke okg okk oko okp okr oks oo- ooa oob ooc oog ook ooo oop oor oos oot op- opa opb opc ope opg opk opo opp opr ops opt or- ora orb orc ore org ork oro orp orr ors ort os- osa osb osc ose osg osk oso osp osr oss ost ot- ota otb otc ote otg otk oto otp otr ots ott p-p paa pab pac pae pag pak pao pap par pas pat pba pbb pbc pbe pbg pbk pbo pbp pbr pbs pbt pca pcb pcc pce pcg pck pco pcp pcr pcs pct pea peb pec pee peg pek peo pep per pes pet pga pgb pgc pge pgg pgk pgo pgp pgr pgs pgt pka pkb pkc pke pkg pko pkp pkr pks pkt poa pob poc poe pog pok poo pop por pos pot ppa ppb ppc ppe ppg ppk ppo ppp ppr pps ppt pra prb prc pre prg prk pro prp prr prs prt ps- psa psb psc pse psg psk pso psp psr pss pst pt- pta ptb ptc pte ptg ptk pto ptp ptr pts ptt ra- raa rab rac rae rag rak rao rap rar ras rat rba rbb rbc rbe rbg rbk rbo rbp rbr rbs rbt rca rcb rcc rce rcg rco rcp rcr rcs rct re- rea reb rec ree reg rek reo