-er a-a a-b a-c a-t aaa aab aac aad aae aam aao aar aat ab- aba abb abc abd abe abm abo abr abt ac- aca acb acc acd ace acm aco acr act ad- ada adb adc add ade adm ado adr adt aea aeb aec aed aee aem aeo aer aet ama amb amc amd ame amm amo amr amt aoa aob aoc aod aoe aom aoo aor aot ar- ara arb arc ard are arm aro arr art at- ata atb atc atd ate atm ato atr att baa bab bac bad bae bam bao bar bat bba bbb bbc bbd bbe bbm bbo bbr bbt bca bcb bcc bcd bce bcm bco bcr bct bda bdb bdc bdd bde bdm bdo bdr bdt be- bea beb bec bed bee bem beo ber bet bma bmb bmc bmd bme bmm bmo bmr bmt boa bob boc bod boe bom boo bor bot bra brb brd bre brm bro brr brt bta btb btc btd bte btm bto btr btt c-- caa cab cac cad cae cam cao car cat cba cbb cbc cbd cbe cbm cbo cbr cbt cca ccb ccc ccd cce ccm cco ccr cct cda cdb cdc cdd cde cdm cdo cdr cdt ce- cea ceb cec ced cee cem ceo cer cet cma cmb cmc cmd cme cmm cmo cmr cmt co- coa cob coc cod coe com coo cor cot cra crb crc crd cre crm cro crr crt cta ctb ctc ctd cte ctm cto ctr ctt daa dab dac dad dae dam dao dar dat dba dbb dbc dbd dbe dbm dbo dbr dbt dca dcb dcc dcd dce dcm dco dcr dct dda ddb ddc ddd dde ddm ddo ddr ddt de- dea deb dec ded dee dem deo der det dma dmb dmc dmd dme dmm dmo dmr dmt doa dob doc dod doe dom doo dor dot dra drb drc drd dre drm dro drr drt dta dtb dtc dtd dte dtm dto dtr dtt eaa eab eac ead eae eam eao ear eat eba ebb ebc ebd ebe ebm ebo ebr ebt ec- eca ecb ecc ecd ece ecm eco ecr ect ed- eda edb edc edd ede edm edo edr edt eea eeb eec eed eee eem eeo eer eet em- ema emb emc emd eme emm emo emr emt eo- eoa eob eoc eod eoe eom eoo eor eot era erb erc erd ere erm ero err ert eta etb etc etd ete etm eto etr ett m-o m-r maa mab mac mad mae mam mao mar mat mba mbb mbc mbd mbe mbm mbo mbr mbt mc- mca mcb mcc mcd mce mcm mco mcr mct mda mdb mdc mdd mde mdm mdo mdr mdt mea meb mec med mee mem meo mer met mma mmb mmc mmd mme mmm mmo mmr mmt moa mob moc mod moe mom moo mor mot mra mrb mrc mrd mre mrm mro mrr mrt mta mtb mtc mtd mte mtm mto mtr mtt oaa oab oac oad oae oam oao oar oat ob- oba obb obc obd obe obm obo obr obt oc- oca ocb occ ocd ocm oco ocr oct oda odb odc odd ode odm odo odr odt oea oeb oec oed oee oem oeo oer oet om- oma omb omc omd ome omm omo omr omt oo- ooa oob ooc ood oom ooo oor oot or- ora orb orc ord ore orm oro orr ort ot- ota otb otc otd ote otm oto otr ott ra- raa rab rac rad rae ram rao rar rat rba rbb rbc rbd rbe rbm rbo rbr rbt rca rcb rcc rcd rce rcm rco rcr rct rda rdb rdc rdd rde rdm rdo rdr rdt re- rea reb rec red ree rem reo rer ret rma rmb rmc rmd rme rmm rmo rmr rmt roa rob roc rod roe rom roo ror rot rra rrb rrc rrd rrm rrr rrt rta rtb rtc rtd rte rtm rto rtr rtt taa tab tac tad tae tam tao tar tat tba tbb tbc tbd tbe tbm tbo tbr tbt tca tcb tcc tcd tce tcm tco tcr tct tda tdb tdc tdd tde tdm tdo tdr tdt te- tea teb tec ted tee tem teo ter tet tma tmb tmc tmd tme tmm tmo tmr tmt to- toa tob toc tod toe tom too tor tot tra trb trc trd tre trm tro trr trt tta ttb ttc ttd tte ttm tto ttr ttt