a-a a-b a-i a-z aaa aab aai aau aaz ab- aba abb abi abu abz ai- aia aib aii aiu aiz au- aua aub aui auz az- aza azb azi azu azz b-u baa bab bai bau baz bba bbb bbi bbu bi- bia bib bii biu biz bua bub bui buu buz bza bzu bzz ia- iaa iab iai iau iaz iba ibb ibi ibu ibz iia iib iii iiu iu- iua iub iui iuz iza izi izu izz ua- uaa uab uai uau uaz uba ubb ubi ubu uia uib uii uiu uua uuu uza uzb uzi uzu zaa zab zai zaz zbb zia zib ziz zub zui zuz zzz