b-u bbb bbs bbt bbu bsb bss bst bsu bsv btb bts btt btu btv bub bus but buu bvb bvs bvt bvu bvv sbb sbs sbt sbu sbv ss- ssb sss sst ssu ssv stb sts stt stu stv sub sus sut suu suv svb svs svt svu svv tbb tbs tbt tbu tbv tsb tss tst tsu tsv ttb tts ttt ttu ttv tub tus tut tuu tuv tvb tvs tvt tvu ubb ubs ubt ubu ubv usb uss ust usu usv utb uts utt utu utv uus uut uuu uvb uvs uvu uvv vbs vbv vsb vss vst vsu vsv vtb vts vtt vtu vtv vus vut vuv vvb vvs vvt vvv

bbbb bbbs bsts bstv btss bttb btus bubb bubs bubu buss bust busu but- buts butt buus s-vt sbbs sbst sbus sssb ssss sstb ssts st-v stbs stss stub stus stut stuv stvs sub- subb subs sus- suss sust susu sutu suus suvs tbbs tbst tsst tsts ttbb ttss tttt tubb tubs tubu tuss tust tuts tutt tutu tvbs tvss tvtv usbs ussb usss usst ussu ustb usts usus uttu uuuu uv-b uvvu vutv vvsb vvvv

bbuss bt-sv btstu bussu busts busut busuu butts butut s-bus sssss stubs stuss subbu subss subst susus suttu tbtbt tbutt ttttt ttusb tubbs tutus usutu uuuuu

bbbbbb bs-tbs bububu bututs stubbs susutv tuttut ubussu vsb-tv vvvvvv

bbbbbbb bustuus sssssss tut-tut tuttuts

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