-al -er a-a a-b aaa aab aae aak aal aar ab- aba abb abe abk abl abr aea aeb aee aek ael aer aka akb ake akk akl akr al- ala alb ale alk all alr ar- ara arb are ark arl arr baa bab bae bak bal bar bba bbb bbe bbk bbl bbr be- bea beb bee bek bel ber bka bkb bke bkk bkl bkr bla blb ble blk bll blr bra brb bre brk brl brr eaa eab eae eak eal ear eba ebb ebe ebk ebl ebr eea eeb eee eek eel eer eka ekb eke ekl ekr ela elb ele elk ell elr era erb ere erk erl err ka- kaa kab kae kak kal kar kba kbb kbe kbk kbl kbr ke- kea keb kee kek kel ker kkb kke kkk kkl kkr kl- kla klb klr kra krk krl krr la- laa lab lae lak lal lar lba lbb lbe lbk lbl lbr lea leb lee lek lel ler lka lkb lkl lkr lla llb lle llk lll llr lra lrb lrk lrr ra- raa rab rae rak ral rar rba rbb rbe rbk rbl rbr re- rea reb ree rek rel rer rkb rke rkk rla rle rll rlr rra rrb rrk rrl rrr