a-a a-b a-t aaa aab aam aan aas aat aau ab- aba abb abm abn abs abt abu ama amb amm amn ams amt amu an- ana anb anm ann ans ant anu as- asa asb asm asn ass ast asu at- ata atb atm atn ats att atu au- aua aub aum aun aus aut b-u baa bab bam ban bas bat bau bba bbb bbm bbn bbs bbt bbu bma bmb bmm bmn bms bmt bmu bna bnb bnn bns bnt bnu bsa bsb bsm bsn bss bst bsu bta btb btm btn bts btt btu bua bub bum bun bus but buu maa mab mam man mas mat mau mba mbb mbm mbs mbt mbu mma mmb mmm mmn mms mmt mmu mna mnb mnm mnn mns mnt mnu msa msb msm msn mss mst msu mta mtb mtm mtn mts mtt mtu mua mub mum mun mus mut muu naa nab nam nan nas nat nau nba nbb nbm nbn nbs nbt nbu nma nmb nmm nmn nms nmt nmu nna nnb nnm nnn nns nnt nnu nsa nsb nsm nsn nss nst nsu nta ntb ntm ntn nts ntt ntu nua nub num nun nus nut nuu saa sab sam san sas sat sau sba sbb sbm sbn sbs sbt sbu sma smb smm smn sms smt smu sna snb snm snn sns snt snu ss- ssa ssb ssm ssn sss sst ssu sta stb stm stn sts stt stu sua sub sum sun sus sut suu taa tab tam tan tas tat tau tba tbb tbm tbn tbs tbt tbu tma tmb tmm tmn tms tmt tmu tna tnb tnm tnn tns tnt tsa tsb tsm tsn tss tst tsu tta ttb ttm ttn tts ttt ttu tua tub tum tun tus tut tuu ua- uaa uab uam uan uas uat uau uba ubb ubn ubs ubt ubu um- uma umb umm umn ums umt umu un- una unb unm unn uns unt unu usa usb usm usn uss ust usu uta utb utm utn uts utt utu uua uum uun uus uut uuu