-er bbb bbc bbd bbe bbm bbo bbr bbt bcb bcc bcd bce bcm bco bcr bct bdb bdc bdd bde bdm bdo bdr bdt be- beb bec bed bee bem beo ber bet bmb bmc bmd bme bmm bmo bmr bmt bob boc bod boe bom boo bor bot brb brd bre brm bro brr brt btb btc btd bte btm bto btr btt c-- cbb cbc cbd cbe cbm cbo cbr cbt ccb ccc ccd cce ccm cco ccr cct cdb cdc cdd cde cdm cdo cdr cdt ce- ceb cec ced cee cem ceo cer cet cmb cmc cmd cme cmm cmo cmr cmt co- cob coc cod coe com coo cor cot crb crc crd cre crm cro crr crt ctb ctc ctd cte ctm cto ctr ctt dbb dbc dbd dbe dbm dbo dbr dbt dcb dcc dcd dce dcm dco dcr dct ddb ddc ddd dde ddm ddo ddr ddt de- deb dec ded dee dem deo der det dmb dmc dmd dme dmm dmo dmr dmt dob doc dod doe dom doo dor dot drb drc drd dre drm dro drr drt dtb dtc dtd dte dtm dto dtr dtt ebb ebc ebd ebe ebm ebo ebr ebt ec- ecb ecc ecd ece ecm eco ecr ect ed- edb edc edd ede edm edo edr edt eeb eec eed eee eem eeo eer eet em- emb emc emd eme emm emo emr emt eo- eob eoc eod eoe eom eoo eor eot erb erc erd ere erm ero err ert etb etc etd ete etm eto etr ett m-o m-r mbb mbc mbd mbe mbm mbo mbr mbt mc- mcb mcc mcd mce mcm mco mcr mct mdb mdc mdd mde mdm mdo mdr mdt meb mec med mee mem meo mer met mmb mmc mmd mme mmm mmo mmr mmt mob moc mod moe mom moo mor mot mrb mrc mrd mre mrm mro mrr mrt mtb mtc mtd mte mtm mto mtr mtt ob- obb obc obd obe obm obo obr obt oc- ocb occ ocd ocm oco ocr oct odb odc odd ode odm odo odr odt oeb oec oed oee oem oeo oer oet om- omb omc omd ome omm omo omr omt oo- oob ooc ood oom ooo oor oot or- orb orc ord ore orm oro orr ort ot- otb otc otd ote otm oto otr ott rbb rbc rbd rbe rbm rbo rbr rbt rcb rcc rcd rce rcm rco rcr rct rdb rdc rdd rde rdm rdo rdr rdt re- reb rec red ree rem reo rer ret rmb rmc rmd rme rmm rmo rmr rmt rob roc rod roe rom roo ror rot rrb rrc rrd rrm rrr rrt rtb rtc rtd rte rtm rto rtr rtt tbb tbc tbd tbe tbm tbo tbr tbt tcb tcc tcd tce tcm tco tcr tct tdb tdc tdd tde tdm tdo tdr tdt te- teb tec ted tee tem teo ter tet tmb tmc tmd tme tmm tmo tmr tmt to- tob toc tod toe tom too tor tot trb trc trd tre trm tro trr trt ttb ttc ttd tte ttm tto ttr ttt