a-a a-b a-t aaa aab aar aas aat aau aav ab- aba abb abr abs abt abu abv ar- ara arb arr ars art aru arv as- asa asb asr ass ast asu asv at- ata atb atr ats att atu atv au- aua aub aur aus aut auv av- ava avb avr avs avt avu b-u baa bab bar bas bat bau bav bba bbb bbr bbs bbt bbu bra brb brr brs brt bru brv bsa bsb bsr bss bst bsu bsv bta btb btr bts btt btu btv bua bub bur bus but buu bva bvb bvr bvs bvt bvu bvv ra- raa rab rar ras rat rau rav rba rbb rbr rbs rbt rbu rra rrb rrr rrs rrt rru rsa rsb rsr rss rst rsu rsv rta rtb rtr rts rtt rtu rtv rua rub rur rus rut ruu ruv rva rvb rvr rvs rvt rvu rvv saa sab sar sas sat sau sav sba sbb sbr sbs sbt sbu sbv sr- sra srb srr srs srt srv ss- ssa ssb ssr sss sst ssu ssv sta stb str sts stt stu stv sua sub sur sus sut suu suv sva svb svr svs svt svu svv taa tab tar tas tat tau tav tba tbb tbr tbs tbt tbu tbv tra trb trr trs trt tru trv tsa tsb tsr tss tst tsu tsv tta ttb ttr tts ttt ttu ttv tua tub tur tus tut tuu tuv tva tvb tvr tvs tvt tvu ua- uaa uab uar uas uat uau uav uba ubb ubr ubs ubt ubu ubv ur- ura urb urr urs urt uru usa usb usr uss ust usu usv uta utb utr uts utt utu utv uua uur uus uut uuu uva uvb uvs uvu uvv v-a vaa vab var vas vat vau vav vba vbr vbs vbv vra vrb vrr vrs vrt vru vsa vsb vsr vss vst vsu vsv vta vtb vtr vts vtt vtu vtv vur vus vut vuv vva vvb vvr vvs vvt vvv