a-a a-b aaa aab aah aao aau aav ab- aba abb abh abo abu abv aha ahb ahh aho ahu ahv aoa aob aoh aoo aou aov au- aua aub auh auo auv av- ava avb avh avo avu b-u baa bab bah bao bau bav bba bbb bbh bbo bbu bha bhb bhh bho bhu bhv boa bob boh boo bou bov bua bub buh buo buu bva bvb bvh bvo bvu bvv haa hab hah hao hau hav hba hbb hbh hbo hbu hbv hha hhb hhh hho hhu hhv hoa hob hoh hoo hou hov hua hub huh huo huu huv hv- hva hvb hvo hvv oaa oab oah oao oau oav ob- oba obb obh obo obu obv oha ohh oho ohu oo- ooa oob ooh ooo oov ou- oua ouh ouo ov- ova ovb ovh ovo ovv ua- uaa uab uah uao uau uav uba ubb ubh ubo ubu ubv uha uhb uhh uho uhu uhv uoa uob uoo uua uuu uva uvb uvo uvu uvv v-a vaa vab vah vao vau vav vba vbh vbo vbv vh- vha vhb vho voa vob voh voo vou vov vuv vva vvb vvo vvv