bbb bbe bbm bbn bbs bbt be- beb bee bem ben bes bet bmb bme bmm bmn bms bmt bnb bne bnn bns bnt bsb bse bsm bsn bss bst btb bte btm btn bts btt ebb ebe ebm ebn ebs ebt eeb eee eem een ees eet em- emb eme emm emn ems emt en- enb ene enm enn ens ent es- esb ese esm esn ess est etb ete etm etn ets ett mbb mbe mbm mbs mbt meb mee mem men mes met mmb mme mmm mmn mms mmt mnb mne mnm mnn mns mnt msb mse msm msn mss mst mtb mte mtm mtn mts mtt nbb nbe nbm nbn nbs nbt ne- neb nee nem nen nes net nmb nme nmm nmn nms nmt nnb nne nnm nnn nns nnt nsb nse nsm nsn nss nst ntb nte ntm ntn nts ntt sbb sbe sbm sbn sbs sbt se- seb see sem sen ses set smb sme smm smn sms smt snb sne snm snn sns snt ss- ssb sse ssm ssn sss sst stb ste stm stn sts stt tbb tbe tbm tbn tbs tbt te- teb tee tem ten tes tet tmb tme tmm tmn tms tmt tnb tne tnm tnn tns tnt tsb tse tsm tsn tss tst ttb tte ttm ttn tts ttt