-al a-a a-b aaa aab aak aal aas ab- aba abb abk abl abs aka akb akk akl aks al- ala alb alk all als as- asa asb ask asl ass baa bab bak bal bas bba bbb bbk bbl bbs bka bkb bkk bkl bks bla blb blk bll bls bsa bsb bsk bsl bss ka- kaa kab kak kal kas kba kbb kbk kbl kbs kkb kkk kkl kks kl- kla klb kls ksa ksb ksk ksl kss la- laa lab lak lal las lba lbb lbk lbl lbs lka lkb lkl lks lla llb llk lll lls lsa lsb lsk lsl lss saa sab sak sal sas sba sbb sbk sbl sbs sk- ska skb skk skl sks sla slb slk sll sls ss- ssa ssb ssk ssl sss