-up b-p b-u bbb bbp bbs bbt bbu bpb bpp bps bpt bpu bsb bsp bss bst bsu btb btp bts btt btu bub bup bus but buu p-p pbb pbp pbs pbt pbu ppb ppp pps ppt ppu ps- psb psp pss pst psu pt- ptb ptp pts ptt ptu pub pup pus put puu sbb sbp sbs sbt sbu spb spp sps spt spu ss- ssb ssp sss sst ssu stb stp sts stt stu sub sup sus sut suu tbb tbp tbs tbt tbu tpb tpp tps tpt tpu tsb tsp tss tst tsu ttb ttp tts ttt ttu tub tup tus tut tuu ubb ubp ubs ubt ubu up- upb upp ups upt upu usb usp uss ust usu utb utp uts utt utu uus uut uuu