-er bbb bbc bbd bbe bbm bbr bbs bcb bcc bcd bce bcm bcr bcs bdb bdc bdd bde bdm bdr bds be- beb bec bed bee bem ber bes bmb bmc bmd bme bmm bmr bms brb brd bre brm brr brs bsb bsc bsd bse bsm bsr bss c-- cbb cbc cbd cbe cbm cbr cbs ccb ccc ccd cce ccm ccr ccs cdb cdc cdd cde cdm cdr cds ce- ceb cec ced cee cem cer ces cmb cmc cmd cme cmm cmr cms crb crc crd cre crm crr crs csb csc csd cse csm csr css dbb dbc dbd dbe dbm dbr dbs dcb dcc dcd dce dcm dcr dcs ddb ddc ddd dde ddm ddr dds de- deb dec ded dee dem der des dmb dmc dmd dme dmm dmr dms drb drc drd dre drm drr drs dsb dsc dsd dse dsm dsr dss ebb ebc ebd ebe ebm ebr ebs ec- ecb ecc ecd ece ecm ecr ecs ed- edb edc edd ede edm edr eds eeb eec eed eee eem eer ees em- emb emc emd eme emm emr ems erb erc erd ere erm err ers es- esb esc esd ese esm esr ess m-r mbb mbc mbd mbe mbm mbr mbs mc- mcb mcc mcd mce mcm mcr mcs mdb mdc mdd mde mdm mdr mds meb mec med mee mem mer mes mmb mmc mmd mme mmm mmr mms mrb mrc mrd mre mrm mrr mrs msb msc msd mse msm msr mss rbb rbc rbd rbe rbm rbr rbs rcb rcc rcd rce rcm rcr rcs rdb rdc rdd rde rdm rdr rds re- reb rec red ree rem rer res rmb rmc rmd rme rmm rmr rms rrb rrc rrd rrm rrr rrs rsb rsc rsd rse rsm rsr rss sbb sbc sbd sbe sbm sbr sbs scb scc scd sce scm scr scs sdb sdc sdd sde sdm sdr sds se- seb sec sed see sem ser ses smb smc smd sme smm smr sms sr- srb src srd sre srm srr srs ss- ssb ssc ssd sse ssm ssr sss