-al -er a-a a-c aaa aac aae aag aak aal aar ac- aca acc ace acg ack acl acr aea aec aee aeg aek ael aer ag- aga agc age agg agk agl agr aka akc ake akg akk akl akr al- ala alc ale alg alk all alr ar- ara arc are arg ark arl arr c-- caa cac cae cag cak cal car cca ccc cce ccg cck ccl ccr ce- cea cec cee ceg cek cel cer cga cgc cge cgg cgl cgr cka ckc cl- cla clc cle clg clk cll clr cra crc cre crg crk crl crr eaa eac eae eag eak eal ear ec- eca ecc ece ecg eck ecl ecr eea eec eee eeg eek eel eer ega egc ege egg egl egr eka ekc eke ekg ekl ekr ela elc ele elg elk ell elr era erc ere erg erk erl err gaa gac gae gag gak gal gar gca gcc gce gcg gck gcl gcr ge- gea gec gee geg gek gel ger gga ggc ggg ggr gka gla glc gle glg glk gll glr gra grc gre grg grk grl grr ka- kaa kac kae kag kak kal kar kca kcc kce kcg kck kcl kcr ke- kea kec kee keg kek kel ker kga kgc kgl kkc kke kkk kkl kkr kl- kla klc klg klr kra krc krg krk krl krr la- laa lac lae lag lak lal lar lca lcc lce lcg lck lcl lcr lea lec lee leg lek lel ler lga lgc lge lgg lgk lgl lgr lka lkg lkl lkr lla llc lle llg llk lll llr lra lrc lrg lrk lrr ra- raa rac rae rag rak ral rar rca rcc rce rcg rcl rcr re- rea rec ree reg rek rel rer rga rgc rge rgg rgk rgr rkc rke rkg rkk rla rlc rle rlg rll rlr rra rrc rrg rrk rrl rrr