-al a-a a-b aaa aab aae aak aal aan ab- aba abb abe abk abl abn aea aeb aee aek ael aen aka akb ake akk akl akn al- ala alb ale alk all aln an- ana anb ane ank anl ann baa bab bae bak bal ban bba bbb bbe bbk bbl bbn be- bea beb bee bek bel ben bka bkb bke bkk bkl bkn bla blb ble blk bll bln bna bnb bne bnk bnl bnn eaa eab eae eak eal ean eba ebb ebe ebk ebl ebn eea eeb eee eek eel een eka ekb eke ekl ela elb ele elk ell eln en- ena enb ene enk enl enn ka- kaa kab kae kak kal kan kba kbb kbe kbk kbl kbn ke- kea keb kee kek kel ken kkb kke kkk kkl kkn kl- kla klb kn- kna kne knk knl knn la- laa lab lae lak lal lan lba lbb lbe lbk lbl lea leb lee lek lel len lka lkb lkl lla llb lle llk lll lln lna lnb lne lnk lnl lnn naa nab nae nak nal nan nba nbb nbe nbk nbl nbn ne- nea neb nee nek nel nen nka nke nkk nkn nla nlb nle nlk nll nln nna nnb nne nnk nnl nnn