-er bbb bbd bbe bbm bbo bbr bdb bdd bde bdm bdo bdr be- beb bed bee bem beo ber bmb bmd bme bmm bmo bmr bob bod boe bom boo bor brb brd bre brm bro brr dbb dbd dbe dbm dbo dbr ddb ddd dde ddm ddo ddr de- deb ded dee dem deo der dmb dmd dme dmm dmo dmr dob dod doe dom doo dor drb drd dre drm dro drr ebb ebd ebe ebm ebo ebr ed- edb edd ede edm edo edr eeb eed eee eem eeo eer em- emb emd eme emm emo emr eo- eob eod eoe eom eoo eor erb erd ere erm ero err m-o m-r mbb mbd mbe mbm mbo mbr mdb mdd mde mdm mdo mdr meb med mee mem meo mer mmb mmd mme mmm mmo mmr mob mod moe mom moo mor mrb mrd mre mrm mro mrr ob- obb obd obe obm obo obr odb odd ode odm odo odr oeb oed oee oem oeo oer om- omb omd ome omm omo omr oo- oob ood oom ooo oor or- orb ord ore orm oro orr rbb rbd rbe rbm rbo rbr rdb rdd rde rdm rdo rdr re- reb red ree rem reo rer rmb rmd rme rmm rmo rmr rob rod roe rom roo ror rrb rrd rrm rrr