a-a a-b a-t aaa aab aam aan aas aat ab- aba abb abm abn abs abt ama amb amm amn ams amt an- ana anb anm ann ans ant as- asa asb asm asn ass ast at- ata atb atm atn ats att baa bab bam ban bas bat bba bbb bbm bbn bbs bbt bma bmb bmm bmn bms bmt bna bnb bnn bns bnt bsa bsb bsm bsn bss bst bta btb btm btn bts btt maa mab mam man mas mat mba mbb mbm mbs mbt mma mmb mmm mmn mms mmt mna mnb mnm mnn mns mnt msa msb msm msn mss mst mta mtb mtm mtn mts mtt naa nab nam nan nas nat nba nbb nbm nbn nbs nbt nma nmb nmm nmn nms nmt nna nnb nnm nnn nns nnt nsa nsb nsm nsn nss nst nta ntb ntm ntn nts ntt saa sab sam san sas sat sba sbb sbm sbn sbs sbt sma smb smm smn sms smt sna snb snm snn sns snt ss- ssa ssb ssm ssn sss sst sta stb stm stn sts stt taa tab tam tan tas tat tba tbb tbm tbn tbs tbt tma tmb tmm tmn tms tmt tna tnb tnm tnn tns tnt tsa tsb tsm tsn tss tst tta ttb ttm ttn tts ttt