-al a-a a-b aaa aab aak aal aar aas ab- aba abb abk abl abr abs aka akb akk akl akr aks al- ala alb alk all alr als ar- ara arb ark arl arr ars as- asa asb ask asl asr ass baa bab bak bal bar bas bba bbb bbk bbl bbr bbs bka bkb bkk bkl bkr bks bla blb blk bll blr bls bra brb brk brl brr brs bsa bsb bsk bsl bsr bss ka- kaa kab kak kal kar kas kba kbb kbk kbl kbr kbs kkb kkk kkl kkr kks kl- kla klb klr kls kra krk krl krr krs ksa ksb ksk ksl ksr kss la- laa lab lak lal lar las lba lbb lbk lbl lbr lbs lka lkb lkl lkr lks lla llb llk lll llr lls lra lrb lrk lrr lrs lsa lsb lsk lsl lsr lss ra- raa rab rak ral rar ras rba rbb rbk rbl rbr rbs rkb rkk rks rla rll rlr rls rra rrb rrk rrl rrr rrs rsa rsb rsk rsl rsr rss saa sab sak sal sar sas sba sbb sbk sbl sbr sbs sk- ska skb skk skl skr sks sla slb slk sll slr sls sr- sra srb srk srl srr srs ss- ssa ssb ssk ssl ssr sss