-er a-a a-c a-t aaa aac aae aam aao aar aat ac- aca acc ace acm aco acr act aea aec aee aem aeo aer aet ama amc ame amm amo amr amt aoa aoc aoe aom aoo aor aot ar- ara arc are arm aro arr art at- ata atc ate atm ato atr att c-- caa cac cae cam cao car cat cca ccc cce ccm cco ccr cct ce- cea cec cee cem ceo cer cet cma cmc cme cmm cmo cmr cmt co- coa coc coe com coo cor cot cra crc cre crm cro crr crt cta ctc cte ctm cto ctr ctt eaa eac eae eam eao ear eat ec- eca ecc ece ecm eco ecr ect eea eec eee eem eeo eer eet em- ema emc eme emm emo emr emt eo- eoa eoc eoe eom eoo eor eot era erc ere erm ero err ert eta etc ete etm eto etr ett m-o m-r maa mac mae mam mao mar mat mc- mca mcc mce mcm mco mcr mct mea mec mee mem meo mer met mma mmc mme mmm mmo mmr mmt moa moc moe mom moo mor mot mra mrc mre mrm mro mrr mrt mta mtc mte mtm mto mtr mtt oaa oac oae oam oao oar oat oc- oca occ ocm oco ocr oct oea oec oee oem oeo oer oet om- oma omc ome omm omo omr omt oo- ooa ooc oom ooo oor oot or- ora orc ore orm oro orr ort ot- ota otc ote otm oto otr ott ra- raa rac rae ram rao rar rat rca rcc rce rcm rco rcr rct re- rea rec ree rem reo rer ret rma rmc rme rmm rmo rmr rmt roa roc roe rom roo ror rot rra rrc rrm rrr rrt rta rtc rte rtm rto rtr rtt taa tac tae tam tao tar tat tca tcc tce tcm tco tcr tct te- tea tec tee tem teo ter tet tma tmc tme tmm tmo tmr tmt to- toa toc toe tom too tor tot tra trc tre trm tro trr trt tta ttc tte ttm tto ttr ttt