-al a-a a-b a-t aaa aab aae aal aat ab- aba abb abe abl abt aea aeb aee ael aet al- ala alb ale all alt at- ata atb ate atl att baa bab bae bal bat bba bbb bbe bbl bbt be- bea beb bee bel bet bla blb ble bll blt bta btb bte btl btt eaa eab eae eal eat eba ebb ebe ebl ebt eea eeb eee eel eet ela elb ele ell elt eta etb ete etl ett la- laa lab lae lal lat lba lbb lbe lbl lbt lea leb lee lel let lla llb lle lll llt lta ltb lte ltl ltt taa tab tae tal tat tba tbb tbe tbl tbt te- tea teb tee tel tet tla tle tll tlt tta ttb tte ttl ttt