-er a-a a-c aaa aac aae aag aak aam aar ac- aca acc ace acg ack acm acr aea aec aee aeg aek aem aer ag- aga agc age agg agk agm agr aka akc ake akg akk akm akr ama amc ame amg amk amm amr ar- ara arc are arg ark arm arr c-- caa cac cae cag cak cam car cca ccc cce ccg cck ccm ccr ce- cea cec cee ceg cek cem cer cga cgc cge cgg cgm cgr cka ckc ckm cma cmc cme cmg cmk cmm cmr cra crc cre crg crk crm crr eaa eac eae eag eak eam ear ec- eca ecc ece ecg eck ecm ecr eea eec eee eeg eek eem eer ega egc ege egg egm egr eka ekc eke ekg ekr em- ema emc eme emg emk emm emr era erc ere erg erk erm err gaa gac gae gag gak gam gar gca gcc gce gcg gck gcm gcr ge- gea gec gee geg gek gem ger gga ggc ggg ggm ggr gka gkm gma gmc gme gmg gmm gmr gra grc gre grg grk grm grr ka- kaa kac kae kag kak kam kar kca kcc kce kcg kck kcm kcr ke- kea kec kee keg kek kem ker kga kgc kgm kkc kke kkk kkm kkr kma kmc kme kmg kmk kmm kra krc krg krk krr m-r maa mac mae mag mak mam mar mc- mca mcc mce mcg mck mcm mcr mea mec mee meg mek mem mer mga mgc mge mgk mgm mgr mka mkc mke mkg mkk mkm mkr mma mmc mme mmg mmk mmm mmr mra mrc mre mrg mrk mrm mrr ra- raa rac rae rag rak ram rar rca rcc rce rcg rcm rcr re- rea rec ree reg rek rem rer rga rgc rge rgg rgk rgr rkc rke rkg rkk rkm rma rmc rme rmg rmm rmr rra rrc rrg rrk rrm rrr