-al a-a a-b a-t aaa aab aae aal aan aat ab- aba abb abe abl abn abt aea aeb aee ael aen aet al- ala alb ale all aln alt an- ana anb ane anl ann ant at- ata atb ate atl atn att baa bab bae bal ban bat bba bbb bbe bbl bbn bbt be- bea beb bee bel ben bet bla blb ble bll bln blt bna bnb bne bnl bnn bnt bta btb bte btl btn btt eaa eab eae eal ean eat eba ebb ebe ebl ebn ebt eea eeb eee eel een eet ela elb ele ell eln elt en- ena enb ene enl enn ent eta etb ete etl etn ett la- laa lab lae lal lan lat lba lbb lbe lbl lbt lea leb lee lel len let lla llb lle lll lln llt lna lnb lne lnl lnn lnt lta ltb lte ltl ltt naa nab nae nal nan nat nba nbb nbe nbl nbn nbt ne- nea neb nee nel nen net nla nlb nle nll nln nlt nna nnb nne nnl nnn nnt nta ntb nte ntn ntt taa tab tae tal tan tat tba tbb tbe tbl tbn tbt te- tea teb tee tel ten tet tla tle tll tln tlt tna tnb tne tnl tnn tnt tta ttb tte ttl ttn ttt