bbb bbm bbn bbs bbt bmb bmm bmn bms bmt bnb bnn bns bnt bsb bsm bsn bss bst btb btm btn bts btt mbb mbm mbs mbt mmb mmm mmn mms mmt mnb mnm mnn mns mnt msb msm msn mss mst mtb mtm mtn mts mtt nbb nbm nbn nbs nbt nmb nmm nmn nms nmt nnb nnm nnn nns nnt nsb nsm nsn nss nst ntb ntm ntn nts ntt sbb sbm sbn sbs sbt smb smm smn sms smt snb snm snn sns snt ss- ssb ssm ssn sss sst stb stm stn sts stt tbb tbm tbn tbs tbt tmb tmm tmn tms tmt tnb tnm tnn tns tnt tsb tsm tsn tss tst ttb ttm ttn tts ttt