-th b-u bbb bbh bbs bbt bbu bhb bhh bhs bht bhu bsb bsh bss bst bsu btb bth bts btt btu bub buh bus but buu hbb hbh hbs hbt hbu hhb hhh hhs hht hhu hsb hsh hss hst hsu htb hth hts htt hub huh hus hut huu sbb sbh sbs sbt sbu sh- shb shh shs sht shu ss- ssb ssh sss sst ssu stb sth sts stt stu sub suh sus sut suu tbb tbh tbs tbt tbu th- thb thh ths tht thu tsb tsh tss tst tsu ttb tth tts ttt ttu tub tuh tus tut tuu ubb ubh ubs ubt ubu uhb uhh uhs uht uhu usb ush uss ust usu utb uth uts utt utu uus uut uuu