-al a-a a-b aaa aab aak aal aar ab- aba abb abk abl abr aka akb akk akl akr al- ala alb alk all alr ar- ara arb ark arl arr baa bab bak bal bar bba bbb bbk bbl bbr bka bkb bkk bkl bkr bla blb blk bll blr bra brb brk brl brr ka- kaa kab kak kal kar kba kbb kbk kbl kbr kkb kkk kkl kkr kl- kla klb klr kra krk krl krr la- laa lab lak lal lar lba lbb lbk lbl lbr lka lkb lkl lkr lla llb llk lll llr lra lrb lrk lrr ra- raa rab rak ral rar rba rbb rbk rbl rbr rkb rkk rla rll rlr rra rrb rrk rrl rrr