-al a-a a-b aaa aab aae aak aal aan aas ab- aba abb abe abk abl abn abs aea aeb aee aek ael aen aes aka akb ake akk akl akn aks al- ala alb ale alk all aln als an- ana anb ane ank anl ann ans as- asa asb ase ask asl asn ass baa bab bae bak bal ban bas bba bbb bbe bbk bbl bbn bbs be- bea beb bee bek bel ben bes bka bkb bke bkk bkl bkn bks bla blb ble blk bll bln bls bna bnb bne bnk bnl bnn bns bsa bsb bse bsk bsl bsn bss eaa eab eae eak eal ean eas eba ebb ebe ebk ebl ebn ebs eea eeb eee eek eel een ees eka ekb eke ekl eks ela elb ele elk ell eln els en- ena enb ene enk enl enn ens es- esa esb ese esk esl esn ess ka- kaa kab kae kak kal kan kas kba kbb kbe kbk kbl kbn kbs ke- kea keb kee kek kel ken kes kkb kke kkk kkl kkn kks kl- kla klb kls kn- kna kne knk knl knn ksa ksb kse ksk ksl ksn kss la- laa lab lae lak lal lan las lba lbb lbe lbk lbl lbs lea leb lee lek lel len les lka lkb lkl lks lla llb lle llk lll lln lls lna lnb lne lnk lnl lnn lns lsa lsb lse lsk lsl lsn lss naa nab nae nak nal nan nas nba nbb nbe nbk nbl nbn nbs ne- nea neb nee nek nel nen nes nka nke nkk nkn nks nla nlb nle nlk nll nln nls nna nnb nne nnk nnl nnn nns nsa nsb nse nsk nsl nsn nss saa sab sae sak sal san sas sba sbb sbe sbk sbl sbn sbs se- sea seb see sek sel sen ses sk- ska skb ske skk skl sks sla slb sle slk sll sln sls sna snb sne snk snl snn sns ss- ssa ssb sse ssk ssl ssn sss