-al -er a-a a-b a-c aaa aab aac aae aak aal aar ab- aba abb abc abe abk abl abr ac- aca acb acc ace ack acl acr aea aeb aec aee aek ael aer aka akb akc ake akk akl akr al- ala alb alc ale alk all alr ar- ara arb arc are ark arl arr baa bab bac bae bak bal bar bba bbb bbc bbe bbk bbl bbr bca bcb bcc bce bck bcl bcr be- bea beb bec bee bek bel ber bka bkb bkc bke bkk bkl bkr bla blb blc ble blk bll blr bra brb bre brk brl brr c-- caa cab cac cae cak cal car cba cbb cbc cbe cbk cbl cbr cca ccb ccc cce cck ccl ccr ce- cea ceb cec cee cek cel cer cka ckb ckc cl- cla clb clc cle clk cll clr cra crb crc cre crk crl crr eaa eab eac eae eak eal ear eba ebb ebc ebe ebk ebl ebr ec- eca ecb ecc ece eck ecl ecr eea eeb eec eee eek eel eer eka ekb ekc eke ekl ekr ela elb elc ele elk ell elr era erb erc ere erk erl err ka- kaa kab kac kae kak kal kar kba kbb kbc kbe kbk kbl kbr kca kcb kcc kce kck kcl kcr ke- kea keb kec kee kek kel ker kkb kkc kke kkk kkl kkr kl- kla klb klc klr kra krc krk krl krr la- laa lab lac lae lak lal lar lba lbb lbc lbe lbk lbl lbr lca lcb lcc lce lck lcl lcr lea leb lec lee lek lel ler lka lkb lkl lkr lla llb llc lle llk lll llr lra lrb lrc lrk lrr ra- raa rab rac rae rak ral rar rba rbb rbc rbe rbk rbl rbr rca rcb rcc rce rcl rcr re- rea reb rec ree rek rel rer rkb rkc rke rkk rla rlc rle rll rlr rra rrb rrc rrk rrl rrr