bbb bbd bbe bbm bbs bdb bdd bde bdm bds be- beb bed bee bem bes bmb bmd bme bmm bms bsb bsd bse bsm bss dbb dbd dbe dbm dbs ddb ddd dde ddm dds de- deb ded dee dem des dmb dmd dme dmm dms dsb dsd dse dsm dss ebb ebd ebe ebm ebs ed- edb edd ede edm eds eeb eed eee eem ees em- emb emd eme emm ems es- esb esd ese esm ess mbb mbd mbe mbm mbs mdb mdd mde mdm mds meb med mee mem mes mmb mmd mme mmm mms msb msd mse msm mss sbb sbd sbe sbm sbs sdb sdd sde sdm sds se- seb sed see sem ses smb smd sme smm sms ss- ssb ssd sse ssm sss