a-a a-b a-t aaa aab aad aat aaw ab- aba abb abd abt abw ad- ada adb add adt adw at- ata atb atd att atw aw- awa awb awd awt aww baa bab bad bat baw bba bbb bbd bbt bbw bda bdb bdd bdt bdw bta btb btd btt btw bwa bwb bwd daa dab dad dat daw dba dbb dbd dbt dda ddb ddd ddt ddw dta dtb dtd dtt dtw dwa dwb dwt dww taa tab tad tat taw tba tbb tbd tbt tda tdb tdd tdt tdw tta ttb ttd ttt ttw twa twb twd twt tww waa wab wad wat waw wba wbb wbd wbt wbw wda wdb wdt wta wtb wtd wtt wtw wwa wwd wwt www