a-a a-b a-t aaa aab aam aas aat aau ab- aba abb abm abs abt abu ama amb amm ams amt amu as- asa asb asm ass ast asu at- ata atb atm ats att atu au- aua aub aum aus aut b-u baa bab bam bas bat bau bba bbb bbm bbs bbt bbu bma bmb bmm bms bmt bmu bsa bsb bsm bss bst bsu bta btb btm bts btt btu bua bub bum bus but buu maa mab mam mas mat mau mba mbb mbm mbs mbt mbu mma mmb mmm mms mmt mmu msa msb msm mss mst msu mta mtb mtm mts mtt mtu mua mub mum mus mut muu saa sab sam sas sat sau sba sbb sbm sbs sbt sbu sma smb smm sms smt smu ss- ssa ssb ssm sss sst ssu sta stb stm sts stt stu sua sub sum sus sut suu taa tab tam tas tat tau tba tbb tbm tbs tbt tbu tma tmb tmm tms tmt tmu tsa tsb tsm tss tst tsu tta ttb ttm tts ttt ttu tua tub tum tus tut tuu ua- uaa uab uam uas uat uau uba ubb ubs ubt ubu um- uma umb umm ums umt umu usa usb usm uss ust usu uta utb utm uts utt utu uua uum uus uut uuu