-er bbb bbc bbd bbe bbm bbo bbr bcb bcc bcd bce bcm bco bcr bdb bdc bdd bde bdm bdo bdr be- beb bec bed bee bem beo ber bmb bmc bmd bme bmm bmo bmr bob boc bod boe bom boo bor brb brd bre brm bro brr c-- cbb cbc cbd cbe cbm cbo cbr ccb ccc ccd cce ccm cco ccr cdb cdc cdd cde cdm cdo cdr ce- ceb cec ced cee cem ceo cer cmb cmc cmd cme cmm cmo cmr co- cob coc cod coe com coo cor crb crc crd cre crm cro crr dbb dbc dbd dbe dbm dbo dbr dcb dcc dcd dce dcm dco dcr ddb ddc ddd dde ddm ddo ddr de- deb dec ded dee dem deo der dmb dmc dmd dme dmm dmo dmr dob doc dod doe dom doo dor drb drc drd dre drm dro drr ebb ebc ebd ebe ebm ebo ebr ec- ecb ecc ecd ece ecm eco ecr ed- edb edc edd ede edm edo edr eeb eec eed eee eem eeo eer em- emb emc emd eme emm emo emr eo- eob eoc eod eoe eom eoo eor erb erc erd ere erm ero err m-o m-r mbb mbc mbd mbe mbm mbo mbr mc- mcb mcc mcd mce mcm mco mcr mdb mdc mdd mde mdm mdo mdr meb mec med mee mem meo mer mmb mmc mmd mme mmm mmo mmr mob moc mod moe mom moo mor mrb mrc mrd mre mrm mro mrr ob- obb obc obd obe obm obo obr oc- ocb occ ocd ocm oco ocr odb odc odd ode odm odo odr oeb oec oed oee oem oeo oer om- omb omc omd ome omm omo omr oo- oob ooc ood oom ooo oor or- orb orc ord ore orm oro orr rbb rbc rbd rbe rbm rbo rbr rcb rcc rcd rce rcm rco rcr rdb rdc rdd rde rdm rdo rdr re- reb rec red ree rem reo rer rmb rmc rmd rme rmm rmo rmr rob roc rod roe rom roo ror rrb rrc rrd rrm rrr