-up a-a a-b a-t aaa aab aap aas aat aau ab- aba abb abp abs abt abu ap- apa apb app aps apt apu as- asa asb asp ass ast asu at- ata atb atp ats att atu au- aua aub aup aus aut b-p b-u baa bab bap bas bat bau bba bbb bbp bbs bbt bbu bpa bpb bpp bps bpt bpu bsa bsb bsp bss bst bsu bta btb btp bts btt btu bua bub bup bus but buu p-p paa pab pap pas pat pau pba pbb pbp pbs pbt pbu ppa ppb ppp pps ppt ppu ps- psa psb psp pss pst psu pt- pta ptb ptp pts ptt ptu pua pub pup pus put puu saa sab sap sas sat sau sba sbb sbp sbs sbt sbu spa spb spp sps spt spu ss- ssa ssb ssp sss sst ssu sta stb stp sts stt stu sua sub sup sus sut suu taa tab tap tas tat tau tba tbb tbp tbs tbt tbu tpa tpb tpp tps tpt tpu tsa tsb tsp tss tst tsu tta ttb ttp tts ttt ttu tua tub tup tus tut tuu ua- uaa uab uap uas uat uau uba ubb ubp ubs ubt ubu up- upa upb upp ups upt upu usa usb usp uss ust usu uta utb utp uts utt utu uua uus uut uuu