-er bbb bbc bbd bbe bbm bbo bbr bbs bbt bcb bcc bcd bce bcm bco bcr bcs bct bdb bdc bdd bde bdm bdo bdr bds bdt be- beb bec bed bee bem beo ber bes bet bmb bmc bmd bme bmm bmo bmr bms bmt bob boc bod boe bom boo bor bos bot brb brd bre brm bro brr brs brt bsb bsc bsd bse bsm bso bsr bss bst btb btc btd bte btm bto btr bts btt c-- cbb cbc cbd cbe cbm cbo cbr cbs cbt ccb ccc ccd cce ccm cco ccr ccs cct cdb cdc cdd cde cdm cdo cdr cds cdt ce- ceb cec ced cee cem ceo cer ces cet cmb cmc cmd cme cmm cmo cmr cms cmt co- cob coc cod coe com coo cor cos cot crb crc crd cre crm cro crr crs crt csb csc csd cse csm cso csr css cst ctb ctc ctd cte ctm cto ctr cts ctt dbb dbc dbd dbe dbm dbo dbr dbs dbt dcb dcc dcd dce dcm dco dcr dcs dct ddb ddc ddd dde ddm ddo ddr dds ddt de- deb dec ded dee dem deo der des det dmb dmc dmd dme dmm dmo dmr dms dmt dob doc dod doe dom doo dor dos dot drb drc drd dre drm dro drr drs drt dsb dsc dsd dse dsm dso dsr dss dst dtb dtc dtd dte dtm dto dtr dts dtt ebb ebc ebd ebe ebm ebo ebr ebs ebt ec- ecb ecc ecd ece ecm eco ecr ecs ect ed- edb edc edd ede edm edo edr eds edt eeb eec eed eee eem eeo eer ees eet em- emb emc emd eme emm emo emr ems emt eo- eob eoc eod eoe eom eoo eor eos eot erb erc erd ere erm ero err ers ert es- esb esc esd ese esm eso esr ess est etb etc etd ete etm eto etr ets ett m-o m-r mbb mbc mbd mbe mbm mbo mbr mbs mbt mc- mcb mcc mcd mce mcm mco mcr mcs mct mdb mdc mdd mde mdm mdo mdr mds mdt meb mec med mee mem meo mer mes met mmb mmc mmd mme mmm mmo mmr mms mmt mob moc mod moe mom moo mor mos mot mrb mrc mrd mre mrm mro mrr mrs mrt msb msc msd mse msm mso msr mss mst mtb mtc mtd mte mtm mto mtr mts mtt ob- obb obc obd obe obm obo obr obs obt oc- ocb occ ocd ocm oco ocr ocs oct odb odc odd ode odm odo odr ods odt oeb oec oed oee oem oeo oer oes oet om- omb omc omd ome omm omo omr oms omt oo- oob ooc ood oom ooo oor oos oot or- orb orc ord ore orm oro orr ors ort os- osb osc osd ose osm oso osr oss ost ot- otb otc otd ote otm oto otr ots ott rbb rbc rbd rbe rbm rbo rbr rbs rbt rcb rcc rcd rce rcm rco rcr rcs rct rdb rdc rdd rde rdm rdo rdr rds rdt re- reb rec red ree rem reo rer res ret rmb rmc rmd rme rmm rmo rmr rms rmt rob roc rod roe rom roo ror ros rot rrb rrc rrd rrm rrr rrs rrt rsb rsc rsd rse rsm rso rsr rss rst rtb rtc rtd rte rtm rto rtr rts rtt sbb sbc sbd sbe sbm sbo sbr sbs sbt scb scc scd sce scm sco scr scs sct sdb sdc sdd sde sdm sdo sdr sds sdt se- seb sec sed see sem seo ser ses set smb smc smd sme smm smo smr sms smt sob soc sod soe som soo sor sos sot sr- srb src srd sre srm sro srr srs srt ss- ssb ssc ssd sse ssm sso ssr sss sst stb stc std ste stm sto str sts stt tbb tbc tbd tbe tbm tbo tbr tbs tbt tcb tcc tcd tce tcm tco tcr tcs tct tdb tdc tdd tde tdm tdo tdr tds tdt te- teb tec ted tee tem teo ter tes tet tmb tmc tmd tme tmm tmo tmr tms tmt to- tob toc tod toe tom too tor tos tot trb trc trd tre trm tro trr trs trt tsb tsc tsd tse tsm tso tsr tss tst ttb ttc ttd tte ttm tto ttr tts ttt