a-a a-b a-z aaa aab aah aao aau aaz ab- aba abb abh abo abu abz aha ahb ahh aho ahu ahz aoa aob aoh aoo aou au- aua aub auh auo auz az- aza azb azo azu azz b-u baa bab bah bao bau baz bba bbb bbh bbo bbu bha bhb bhh bho bhu boa bob boh boo bou boz bua bub buh buo buu buz bza bzh bzo bzu bzz haa hab hah hao hau haz hba hbb hbh hbo hbu hbz hha hhb hhh hho hhu hhz hoa hob hoh hoo hou hua hub huh huo huu huz hzo oaa oab oah oao oau ob- oba obb obh obo obu oha ohh oho ohu oo- ooa oob ooh ooo ou- oua ouh ouo oza ozo ozu ozz ua- uaa uab uah uao uau uaz uba ubb ubh ubo ubu uha uhb uhh uho uhu uoa uob uoo uua uuu uza uzb uzh uzo uzu zaa zab zah zao zaz zbb zha zho zhu zo- zoa zob zoo zou zub zuz zzz