-er a-a a-b aaa aab aad aae aag aam aao aar ab- aba abb abd abe abg abm abo abr ad- ada adb add ade adg adm ado adr aea aeb aed aee aeg aem aeo aer ag- aga agb agd age agg agm ago agr ama amb amd ame amg amm amo amr aoa aob aod aoe aog aom aoo aor ar- ara arb ard are arg arm aro arr baa bab bad bae bag bam bao bar bba bbb bbd bbe bbg bbm bbo bbr bda bdb bdd bde bdg bdm bdo bdr be- bea beb bed bee beg bem beo ber bga bgb bgd bge bgg bgm bgo bgr bma bmb bmd bme bmg bmm bmo bmr boa bob bod boe bog bom boo bor bra brb brd bre brg brm bro brr daa dab dad dae dag dam dao dar dba dbb dbd dbe dbg dbm dbo dbr dda ddb ddd dde ddg ddm ddo ddr de- dea deb ded dee deg dem deo der dga dgd dge dgg dgm dgr dma dmb dmd dme dmg dmm dmo dmr doa dob dod doe dog dom doo dor dra drb drd dre drg drm dro drr eaa eab ead eae eag eam eao ear eba ebb ebd ebe ebg ebm ebo ebr ed- eda edb edd ede edg edm edo edr eea eeb eed eee eeg eem eeo eer ega egb egd ege egg egm ego egr em- ema emb emd eme emg emm emo emr eo- eoa eob eod eoe eog eom eoo eor era erb erd ere erg erm ero err g-d gaa gab gad gae gag gam gao gar gba gbd gbe gbg gbm gbo gbr gda gdb gdd gde gdm gdo gdr ge- gea geb ged gee geg gem geo ger gga ggb ggd ggg ggm ggo ggr gma gmb gmd gme gmg gmm gmo gmr goa gob god goe gog gom goo gor gra grb grd gre grg grm gro grr m-o m-r maa mab mad mae mag mam mao mar mba mbb mbd mbe mbg mbm mbo mbr mda mdb mdd mde mdg mdm mdo mdr mea meb med mee meg mem meo mer mga mgb mgd mge mgm mgo mgr mma mmb mmd mme mmg mmm mmo mmr moa mob mod moe mog mom moo mor mra mrb mrd mre mrg mrm mro mrr oaa oab oad oae oag oam oao oar ob- oba obb obd obe obg obm obo obr oda odb odd ode odg odm odo odr oea oeb oed oee oeg oem oeo oer oga ogd oge ogg ogo om- oma omb omd ome omg omm omo omr oo- ooa oob ood oog oom ooo oor or- ora orb ord ore org orm oro orr ra- raa rab rad rae rag ram rao rar rba rbb rbd rbe rbg rbm rbo rbr rda rdb rdd rde rdg rdm rdo rdr re- rea reb red ree reg rem reo rer rga rgb rgd rge rgg rgo rgr rma rmb rmd rme rmg rmm rmo rmr roa rob rod roe rog rom roo ror rra rrb rrd rrg rrm rrr