-al a-a a-b aaa aab aae aak aal aas ab- aba abb abe abk abl abs aea aeb aee aek ael aes aka akb ake akk akl aks al- ala alb ale alk all als as- asa asb ase ask asl ass baa bab bae bak bal bas bba bbb bbe bbk bbl bbs be- bea beb bee bek bel bes bka bkb bke bkk bkl bks bla blb ble blk bll bls bsa bsb bse bsk bsl bss eaa eab eae eak eal eas eba ebb ebe ebk ebl ebs eea eeb eee eek eel ees eka ekb eke ekl eks ela elb ele elk ell els es- esa esb ese esk esl ess ka- kaa kab kae kak kal kas kba kbb kbe kbk kbl kbs ke- kea keb kee kek kel kes kkb kke kkk kkl kks kl- kla klb kls ksa ksb kse ksk ksl kss la- laa lab lae lak lal las lba lbb lbe lbk lbl lbs lea leb lee lek lel les lka lkb lkl lks lla llb lle llk lll lls lsa lsb lse lsk lsl lss saa sab sae sak sal sas sba sbb sbe sbk sbl sbs se- sea seb see sek sel ses sk- ska skb ske skk skl sks sla slb sle slk sll sls ss- ssa ssb sse ssk ssl sss