-er a-a a-b a-i a-t aaa aab aad aae aai aan aao aar aas aat ab- aba abb abd abe abi abn abo abr abs abt ad- ada adb add ade adi adn ado adr ads adt aea aeb aed aee aei aen aeo aer aes aet ai- aia aib aid aie aii ain aio air ais ait an- ana anb and ane ani ann ano anr ans ant aoa aob aod aoe aoi aon aoo aor aos aot ar- ara arb ard are ari arn aro arr ars art as- asa asb asd ase asi asn aso asr ass ast at- ata atb atd ate ati atn ato atr ats att baa bab bad bae bai ban bao bar bas bat bba bbb bbd bbe bbi bbn bbo bbr bbs bbt bda bdb bdd bde bdi bdo bdr bds bdt be- bea beb bed bee bei ben beo ber bes bet bi- bia bib bid bie bii bin bio bir bis bit bna bnb bnd bne bni bnn bno bnr bns bnt boa bob bod boe boi bon boo bor bos bot bra brb brd bre bri brn bro brr brs brt bsa bsb bsd bse bsi bsn bso bsr bss bst bta btb btd bte bti btn bto btr bts btt daa dab dad dae dai dan dao dar das dat dba dbb dbd dbe dbi dbn dbo dbr dbs dbt dda ddb ddd dde ddi ddn ddo ddr dds ddt de- dea deb ded dee dei den deo der des det di- dia dib did die dii din dio dir dis dit dna dnb dnd dne dni dnn dno dnr dns dnt doa dob dod doe doi don doo dor dos dot dra drb drd dre dri drn dro drr drs drt dsa dsb dsd dse dsi dsn dso dsr dss dst dta dtb dtd dte dti dtn dto dtr dts dtt eaa eab ead eae eai ean eao ear eas eat eba ebb ebd ebe ebi ebn ebo ebr ebs ebt ed- eda edb edd ede edi edn edo edr eds edt eea eeb eed eee een eeo eer ees eet eia eib eid eie eii ein eio eir eis eit en- ena enb end ene eni enn eno enr ens ent eo- eoa eob eod eoe eoi eon eoo eor eos eot era erb erd ere eri ern ero err ers ert es- esa esb esd ese esi esn eso esr ess est eta etb etd ete eti etn eto etr ets ett i-d ia- iaa iab iad iae iai ian iao iar ias iat iba ibb ibd ibe ibi ibn ibo ibr ibs ibt ida idb idd ide idi idn ido idr ids idt ie- iea ied iee iei ien ier ies iet iia iib iid iie iii iin iio iir iis iit in- ina inb ind ine ini inn ino inr ins int io- ioa iob iod ioe ioi ion ioo ior ios iot ir- ira irb ird ire iri irn iro irr irs irt is- isa isb isd ise isi isn iso isr iss ist ita itb itd ite iti itn ito its itt n-i naa nab nad nae nai nan nao nar nas nat nba nbb nbd nbe nbi nbn nbo nbr nbs nbt nda ndb ndd nde ndi ndn ndo ndr nds ndt ne- nea neb ned nee nei nen neo ner nes net nia nib nid nie nii nin nio nir nis nit nna nnb nne nni nnn nno nns nnt no- noa nob nod noe noi non noo nor nos not nra nrb nrd nre nri nrn nro nrr nrs nrt nsa nsb nsd nse nsi nsn nso nsr nss nst nta ntb ntd nte nti ntn nto ntr nts ntt o-i oaa oab oad oae oai oan oao oar oas oat ob- oba obb obd obe obi obn obo obr obs obt oda odb odd ode odi odn odo odr ods odt oea oeb oed oee oei oen oeo oer oes oet oia oib oid oie oii oin oio oir ois oit on- ona onb ond one oni onn ono onr ons ont oo- ooa oob ood ooi oon ooo oor oos oot or- ora orb ord ore ori orn oro orr ors ort os- osa osb osd ose osi osn oso osr oss ost ot- ota otb otd ote oti otn oto otr ots ott ra- raa rab rad rae rai ran rao rar ras rat rba rbb rbd rbe rbi rbn rbo rbr rbs rbt rda rdb rdd rde rdi rdn rdo rdr rds rdt re- rea reb red ree rei ren reo rer res ret ria rib rid rie rii rin rio rir ris rit rna rnb rnd rni rnn rno rnr rns rnt roa rob rod roe roi ron roo ror ros rot rra rrb rrd rri rrn rrr rrs rrt rsa rsb rsd rse rsi rsn rso rsr rss rst rta rtb rtd rte rti rtn rto rtr rts rtt saa sab sad sae sai san sao sar sas sat sba sbb sbd sbe sbi sbn sbo sbr sbs sbt sda sdb sdd sde sdi sdn sdo sdr sds sdt se- sea seb sed see sei sen seo ser ses set sia sib sid sie sii sin sio sir sis sit sna snb snd sne sni snn sno snr sns snt soa sob sod soe soi son soo sor sos sot sr- sra srb srd sre sri srn sro srr srs srt ss- ssa ssb ssd sse ssi ssn sso ssr sss sst sta stb std ste sti stn sto str sts stt taa tab tad tae tai tan tao tar tas tat tba tbb tbd tbe tbi tbn tbo tbr tbs tbt tda tdb tdd tde tdi tdn tdo tdr tds tdt te- tea teb ted tee tei ten teo ter tes tet tia tib tid tie tii tin tio tir tis tit tna tnb tnd tne tni tnn tno tnr tns tnt to- toa tob tod toe toi ton too