a-a a-b a-t a-z aaa aab aad aae aat aaz ab- aba abb abd abe abt abz ad- ada adb add ade adt adz aea aeb aed aee aet aez at- ata atb atd ate att atz az- aza azb azd aze azt azz baa bab bad bae bat baz bba bbb bbd bbe bbt bda bdb bdd bde bdt bdz be- bea beb bed bee bet bez bta btb btd bte btt btz bza bzd bze bzz daa dab dad dae dat daz dba dbb dbd dbe dbt dbz dda ddb ddd dde ddt ddz de- dea deb ded dee det dez dta dtb dtd dte dtt dtz dza dzb dzd dze eaa eab ead eae eat eaz eba ebb ebd ebe ebt ed- eda edb edd ede edt eea eeb eed eee eet eta etb etd ete ett etz eze ezz taa tab tad tae tat taz tba tbb tbd tbe tbt tbz tda tdb tdd tde tdt te- tea teb ted tee tet tez tta ttb ttd tte ttt tza tzd tze zaa zab zad zat zaz zbb zbt zdt zea zeb zed zee zet zez zta zte zzt zzz