-er a-a a-c a-t aaa aac aae aam aap aar aat ac- aca acc ace acm acp acr act aea aec aee aem aep aer aet ama amc ame amm amp amr amt ap- apa apc ape apm app apr apt ar- ara arc are arm arp arr art at- ata atc ate atm atp atr att c-- caa cac cae cam cap car cat cca ccc cce ccm ccp ccr cct ce- cea cec cee cem cep cer cet cma cmc cme cmm cmp cmr cmt cpa cpc cpe cpm cpp cpr cpt cra crc cre crm crp crr crt cta ctc cte ctm ctp ctr ctt eaa eac eae eam eap ear eat ec- eca ecc ece ecm ecr ect eea eec eee eem eep eer eet em- ema emc eme emm emp emr emt ep- epa epc epe epm epp epr ept era erc ere erm erp err ert eta etc ete etm etp etr ett m-r maa mac mae mam map mar mat mc- mca mcc mce mcm mcp mcr mct mea mec mee mem mep mer met mma mmc mme mmm mmp mmr mmt mpa mpc mpe mpm mpp mpr mpt mra mrc mre mrm mrp mrr mrt mta mtc mte mtm mtp mtr mtt p-p paa pac pae pam pap par pat pca pcc pce pcm pcp pcr pct pea pec pee pem pep per pet pma pmc pme pmm pmp pmr pmt ppa ppc ppe ppm ppp ppr ppt pra prc pre prm prp prr prt pt- pta ptc pte ptm ptp ptr ptt ra- raa rac rae ram rap rar rat rca rcc rce rcm rcp rcr rct re- rea rec ree rem rep rer ret rma rmc rme rmm rmp rmr rmt rpa rpc rpe rpm rpp rpr rpt rra rrc rrm rrp rrr rrt rta rtc rte rtm rtp rtr rtt taa tac tae tam tap tar tat tca tcc tce tcm tcp tcr tct te- tea tec tee tem tep ter tet tma tmc tme tmm tmp tmr tmt tpa tpc tpe tpm tpp tpr tpt tra trc tre trm trp trr trt tta ttc tte ttm ttp ttr ttt