a-a a-b a-z aaa aab aad aae aau aaz ab- aba abb abd abe abu abz ad- ada adb add ade adu adz aea aeb aed aee aeu aez au- aua aub aud aue auz az- aza azb azd aze azu azz b-u baa bab bad bae bau baz bba bbb bbd bbe bbu bda bdb bdd bde bdu bdz be- bea beb bed bee beu bez bua bub bud bue buu buz bza bzd bze bzu bzz daa dab dad dae dau daz dba dbb dbd dbe dbu dbz dda ddb ddd dde ddu ddz de- dea deb ded dee deu dez dua dub dud due duz dza dzb dzd dze dzu eaa eab ead eae eau eaz eba ebb ebd ebe ebu ed- eda edb edd ede edu eea eeb eed eee eu- eua eub eud eue eze ezz ua- uaa uab uad uae uau uaz uba ubb ube ubu uda udb udd ude udu uea ueb ued uee uua uue uuu uza uzb uzu zaa zab zad zaz zbb zea zeb zed zee zez zub zud zuz zzz