-al -er a-a a-b a-c aaa aab aac aae aag aak aal aar ab- aba abb abc abe abg abk abl abr ac- aca acb acc ace acg ack acl acr aea aeb aec aee aeg aek ael aer ag- aga agb agc age agg agk agl agr aka akb akc ake akg akk akl akr al- ala alb alc ale alg alk all alr ar- ara arb arc are arg ark arl arr baa bab bac bae bag bak bal bar bba bbb bbc bbe bbg bbk bbl bbr bca bcb bcc bce bcg bck bcl bcr be- bea beb bec bee beg bek bel ber bga bgb bgc bge bgg bgk bgl bgr bka bkb bkc bke bkg bkk bkl bkr bla blb blc ble blg blk bll blr bra brb bre brg brk brl brr c-- caa cab cac cae cag cak cal car cba cbb cbc cbe cbg cbk cbl cbr cca ccb ccc cce ccg cck ccl ccr ce- cea ceb cec cee ceg cek cel cer cga cgb cgc cge cgg cgl cgr cka ckb ckc cl- cla clb clc cle clg clk cll clr cra crb crc cre crg crk crl crr eaa eab eac eae eag eak eal ear eba ebb ebc ebe ebg ebk ebl ebr ec- eca ecb ecc ece ecg eck ecl ecr eea eeb eec eee eeg eek eel eer ega egb egc ege egg egl egr eka ekb ekc eke ekg ekl ekr ela elb elc ele elg elk ell elr era erb erc ere erg erk erl err gaa gab gac gae gag gak gal gar gba gbc gbe gbg gbk gbl gbr gca gcb gcc gce gcg gck gcl gcr ge- gea geb gec gee geg gek gel ger gga ggb ggc ggg ggr gka gkb gla glb glc gle glg glk gll glr gra grb grc gre grg grk grl grr ka- kaa kab kac kae kag kak kal kar kba kbb kbc kbe kbk kbl kbr kca kcb kcc kce kcg kck kcl kcr ke- kea keb kec kee keg kek kel ker kga kgb kgc kgl kkb kkc kke kkk kkl kkr kl- kla klb klc klg klr kra krc krg krk krl krr la- laa lab lac lae lag lak lal lar lba lbb lbc lbe lbg lbk lbl lbr lca lcb lcc lce lcg lck lcl lcr lea leb lec lee leg lek lel ler lga lgb lgc lge lgg lgk lgl lgr lka lkb lkg lkl lkr lla llb llc lle llg llk lll llr lra lrb lrc lrg lrk lrr ra- raa rab rac rae rag rak ral rar rba rbb rbc rbe rbg rbk rbl rbr rca rcb rcc rce rcg rcl rcr re- rea reb rec ree reg rek rel rer rga rgb rgc rge rgg rgk rgr rkb rkc rke rkg rkk rla rlc rle rlg rll rlr rra rrb rrc rrg rrk rrl rrr