bbb bbe bbm bbn bbs be- beb bee bem ben bes bmb bme bmm bmn bms bnb bne bnn bns bsb bse bsm bsn bss ebb ebe ebm ebn ebs eeb eee eem een ees em- emb eme emm emn ems en- enb ene enm enn ens es- esb ese esm esn ess mbb mbe mbm mbs meb mee mem men mes mmb mme mmm mmn mms mnb mne mnm mnn mns msb mse msm msn mss nbb nbe nbm nbn nbs ne- neb nee nem nen nes nmb nme nmm nmn nms nnb nne nnm nnn nns nsb nse nsm nsn nss sbb sbe sbm sbn sbs se- seb see sem sen ses smb sme smm smn sms snb sne snm snn sns ss- ssb sse ssm ssn sss