-er a-a a-c a-t aaa aac aae aak aam aao aar aat ac- aca acc ace ack acm aco acr act aea aec aee aek aem aeo aer aet aka akc ake akk akm ako akr ama amc ame amk amm amo amr amt aoa aoc aoe aok aom aoo aor aot ar- ara arc are ark arm aro arr art at- ata atc ate atm ato atr att c-- caa cac cae cak cam cao car cat cca ccc cce cck ccm cco ccr cct ce- cea cec cee cek cem ceo cer cet cka ckc ckm cko ckt cma cmc cme cmk cmm cmo cmr cmt co- coa coc coe cok com coo cor cot cra crc cre crk crm cro crr crt cta ctc cte ctk ctm cto ctr ctt eaa eac eae eak eam eao ear eat ec- eca ecc ece eck ecm eco ecr ect eea eec eee eek eem eeo eer eet eka ekc eke eko ekr ekt em- ema emc eme emk emm emo emr emt eo- eoa eoc eoe eok eom eoo eor eot era erc ere erk erm ero err ert eta etc ete etk etm eto etr ett k-t ka- kaa kac kae kak kam kao kar kat kca kcc kce kck kcm kcr kct ke- kea kec kee kek kem keo ker ket kkc kke kkk kkm kkr kkt kma kmc kme kmk kmm kmo kmt koa koc koe kok kom koo kor kot kra krc krk kro krr krt kta ktc kte ktk ktm kto ktr ktt m-o m-r maa mac mae mak mam mao mar mat mc- mca mcc mce mck mcm mco mcr mct mea mec mee mek mem meo mer met mka mkc mke mkk mkm mko mkr mkt mma mmc mme mmk mmm mmo mmr mmt moa moc moe mok mom moo mor mot mra mrc mre mrk mrm mro mrr mrt mta mtc mte mtk mtm mto mtr mtt oaa oac oae oak oam oao oar oat oc- oca occ ock ocm oco ocr oct oea oec oee oem oeo oer oet oka okc oke okk oko okr om- oma omc ome omm omo omr omt oo- ooa ooc ook oom ooo oor oot or- ora orc ore ork orm oro orr ort ot- ota otc ote otk otm oto otr ott ra- raa rac rae rak ram rao rar rat rca rcc rce rcm rco rcr rct re- rea rec ree rek rem reo rer ret rkc rke rkk rkm rko rkt rma rmc rme rmm rmo rmr rmt roa roc roe rok rom roo ror rot rra rrc rrk rrm rrr rrt rta rtc rte rtk rtm rto rtr rtt taa tac tae tak tam tao tar tat tca tcc tce tck tcm tco tcr tct te- tea tec tee tek tem teo ter tet tka tkc tke tkk tkm tko tkr tkt tma tmc tme tmk tmm tmo tmr tmt to- toa toc toe tok tom too tor tot tra trc tre trk trm tro trr trt tta ttc tte ttk ttm tto ttr ttt