a-a a-b a-t aaa aab aao aas aat aau aav ab- aba abb abo abs abt abu abv aoa aob aoo aos aot aou aov as- asa asb aso ass ast asu asv at- ata atb ato ats att atu atv au- aua aub auo aus aut auv av- ava avb avo avs avt avu b-u baa bab bao bas bat bau bav bba bbb bbo bbs bbt bbu boa bob boo bos bot bou bov bsa bsb bso bss bst bsu bsv bta btb bto bts btt btu btv bua bub buo bus but buu bva bvb bvo bvs bvt bvu bvv oaa oab oao oas oat oau oav ob- oba obb obo obs obt obu obv oo- ooa oob ooo oos oot oov os- osa osb oso oss ost osu osv ot- ota otb oto ots ott otu otv ou- oua ouo ous out ov- ova ovb ovo ovs ovv saa sab sao sas sat sau sav sba sbb sbo sbs sbt sbu sbv soa sob soo sos sot sou sov ss- ssa ssb sso sss sst ssu ssv sta stb sto sts stt stu stv sua sub suo sus sut suu suv sva svb svo svs svt svu svv taa tab tao tas tat tau tav tba tbb tbo tbs tbt tbu tbv to- toa tob too tos tot tou tov tsa tsb tso tss tst tsu tsv tta ttb tto tts ttt ttu ttv tua tub tuo tus tut tuu tuv tva tvb tvo tvs tvt tvu ua- uaa uab uao uas uat uau uav uba ubb ubo ubs ubt ubu ubv uoa uob uoo uos uot usa usb uso uss ust usu usv uta utb uto uts utt utu utv uua uus uut uuu uva uvb uvo uvs uvu uvv v-a vaa vab vao vas vat vau vav vba vbo vbs vbv voa vob voo vos vot vou vov vsa vsb vso vss vst vsu vsv vta vtb vto vts vtt vtu vtv vus vut vuv vva vvb vvo vvs vvt vvv