-al a-a a-b aaa aab aae aal aan ab- aba abb abe abl abn aea aeb aee ael aen al- ala alb ale all aln an- ana anb ane anl ann baa bab bae bal ban bba bbb bbe bbl bbn be- bea beb bee bel ben bla blb ble bll bln bna bnb bne bnl bnn eaa eab eae eal ean eba ebb ebe ebl ebn eea eeb eee eel een ela elb ele ell eln en- ena enb ene enl enn la- laa lab lae lal lan lba lbb lbe lbl lea leb lee lel len lla llb lle lll lln lna lnb lne lnl lnn naa nab nae nal nan nba nbb nbe nbl nbn ne- nea neb nee nel nen nla nlb nle nll nln nna nnb nne nnl nnn