-er a-a a-b a-i aaa aab aad aae aai aam aao aar ab- aba abb abd abe abi abm abo abr ad- ada adb add ade adi adm ado adr aea aeb aed aee aei aem aeo aer ai- aia aib aid aie aii aim aio air ama amb amd ame ami amm amo amr aoa aob aod aoe aoi aom aoo aor ar- ara arb ard are ari arm aro arr baa bab bad bae bai bam bao bar bba bbb bbd bbe bbi bbm bbo bbr bda bdb bdd bde bdi bdm bdo bdr be- bea beb bed bee bei bem beo ber bi- bia bib bid bie bii bim bio bir bma bmb bmd bme bmi bmm bmo bmr boa bob bod boe boi bom boo bor bra brb brd bre bri brm bro brr daa dab dad dae dai dam dao dar dba dbb dbd dbe dbi dbm dbo dbr dda ddb ddd dde ddi ddm ddo ddr de- dea deb ded dee dei dem deo der di- dia dib did die dii dim dio dir dma dmb dmd dme dmi dmm dmo dmr doa dob dod doe doi dom doo dor dra drb drd dre dri drm dro drr eaa eab ead eae eai eam eao ear eba ebb ebd ebe ebi ebm ebo ebr ed- eda edb edd ede edi edm edo edr eea eeb eed eee eem eeo eer eia eib eid eie eii eim eio eir em- ema emb emd eme emi emm emo emr eo- eoa eob eod eoe eoi eom eoo eor era erb erd ere eri erm ero err i-d ia- iaa iab iad iae iai iam iao iar iba ibb ibd ibe ibi ibm ibo ibr ida idb idd ide idi idm ido idr ie- iea ied iee iei iem ier iia iib iid iie iii iim iio iir im- ima imb imd ime imi imm imo io- ioa iob iod ioe ioi iom ioo ior ir- ira irb ird ire iri irm iro irr m-o m-r maa mab mad mae mai mam mao mar mba mbb mbd mbe mbi mbm mbo mbr mda mdb mdd mde mdi mdm mdo mdr mea meb med mee mei mem meo mer mi- mia mib mid mie mii mim mio mir mma mmb mmd mme mmi mmm mmo mmr moa mob mod moe moi mom moo mor mra mrb mrd mre mri mrm mro mrr o-i oaa oab oad oae oai oam oao oar ob- oba obb obd obe obi obm obo obr oda odb odd ode odi odm odo odr oea oeb oed oee oei oem oeo oer oia oib oid oie oii oim oio oir om- oma omb omd ome omi omm omo omr oo- ooa oob ood ooi oom ooo oor or- ora orb ord ore ori orm oro orr ra- raa rab rad rae rai ram rao rar rba rbb rbd rbe rbi rbm rbo rbr rda rdb rdd rde rdi rdm rdo rdr re- rea reb red ree rei rem reo rer ria rib rid rie rii rim rio rir rma rmb rmd rme rmi rmm rmo rmr roa rob rod roe roi rom roo ror rra rrb rrd rri rrm rrr