a-a a-b a-z aaa aab aae aao aau aaz ab- aba abb abe abo abu abz aea aeb aee aeo aeu aez aoa aob aoe aoo aou au- aua aub aue auo auz az- aza azb aze azo azu azz b-u baa bab bae bao bau baz bba bbb bbe bbo bbu be- bea beb bee beo beu bez boa bob boe boo bou boz bua bub bue buo buu buz bza bze bzo bzu bzz eaa eab eae eao eau eaz eba ebb ebe ebo ebu eea eeb eee eeo eo- eoa eob eoe eoo eou eu- eua eub eue eze ezo ezz oaa oab oae oao oau ob- oba obb obe obo obu oea oeb oee oeo oo- ooa oob ooo ou- oua oue ouo oza oze ozo ozu ozz ua- uaa uab uae uao uau uaz uba ubb ube ubo ubu uea ueb uee uoa uob uoe uoo uua uue uuu uza uzb uzo uzu zaa zab zao zaz zbb zea zeb zee zeo zez zo- zoa zob zoe zoo zou zub zuz zzz