bbb bbe bbm bbs bbt be- beb bee bem bes bet bmb bme bmm bms bmt bsb bse bsm bss bst btb bte btm bts btt ebb ebe ebm ebs ebt eeb eee eem ees eet em- emb eme emm ems emt es- esb ese esm ess est etb ete etm ets ett mbb mbe mbm mbs mbt meb mee mem mes met mmb mme mmm mms mmt msb mse msm mss mst mtb mte mtm mts mtt sbb sbe sbm sbs sbt se- seb see sem ses set smb sme smm sms smt ss- ssb sse ssm sss sst stb ste stm sts stt tbb tbe tbm tbs tbt te- teb tee tem tes tet tmb tme tmm tms tmt tsb tse tsm tss tst ttb tte ttm tts ttt