a-a a-b a-t aaa aab aas aat aau aav ab- aba abb abs abt abu abv as- asa asb ass ast asu asv at- ata atb ats att atu atv au- aua aub aus aut auv av- ava avb avs avt avu b-u baa bab bas bat bau bav bba bbb bbs bbt bbu bsa bsb bss bst bsu bsv bta btb bts btt btu btv bua bub bus but buu bva bvb bvs bvt bvu bvv saa sab sas sat sau sav sba sbb sbs sbt sbu sbv ss- ssa ssb sss sst ssu ssv sta stb sts stt stu stv sua sub sus sut suu suv sva svb svs svt svu svv taa tab tas tat tau tav tba tbb tbs tbt tbu tbv tsa tsb tss tst tsu tsv tta ttb tts ttt ttu ttv tua tub tus tut tuu tuv tva tvb tvs tvt tvu ua- uaa uab uas uat uau uav uba ubb ubs ubt ubu ubv usa usb uss ust usu usv uta utb uts utt utu utv uua uus uut uuu uva uvb uvs uvu uvv v-a vaa vab vas vat vau vav vba vbs vbv vsa vsb vss vst vsu vsv vta vtb vts vtt vtu vtv vus vut vuv vva vvb vvs vvt vvv