-er a-a a-b a-i a-t aaa aab aad aae aag aai aao aar aas aat ab- aba abb abd abe abg abi abo abr abs abt ad- ada adb add ade adg adi ado adr ads adt aea aeb aed aee aeg aei aeo aer aes aet ag- aga agb agd age agg agi ago agr ags agt ai- aia aib aid aie aig aii aio air ais ait aoa aob aod aoe aog aoi aoo aor aos aot ar- ara arb ard are arg ari aro arr ars art as- asa asb asd ase asg asi aso asr ass ast at- ata atb atd ate atg ati ato atr ats att baa bab bad bae bag bai bao bar bas bat bba bbb bbd bbe bbg bbi bbo bbr bbs bbt bda bdb bdd bde bdg bdi bdo bdr bds bdt be- bea beb bed bee beg bei beo ber bes bet bga bgb bgd bge bgg bgi bgo bgr bgs bgt bi- bia bib bid bie big bii bio bir bis bit boa bob bod boe bog boi boo bor bos bot bra brb brd bre brg bri bro brr brs brt bsa bsb bsd bse bsg bsi bso bsr bss bst bta btb btd bte btg bti bto btr bts btt daa dab dad dae dag dai dao dar das dat dba dbb dbd dbe dbg dbi dbo dbr dbs dbt dda ddb ddd dde ddg ddi ddo ddr dds ddt de- dea deb ded dee deg dei deo der des det dga dgd dge dgg dgi dgr dgs dgt di- dia dib did die dig dii dio dir dis dit doa dob dod doe dog doi doo dor dos dot dra drb drd dre drg dri dro drr drs drt dsa dsb dsd dse dsg dsi dso dsr dss dst dta dtb dtd dte dtg dti dto dtr dts dtt eaa eab ead eae eag eai eao ear eas eat eba ebb ebd ebe ebg ebi ebo ebr ebs ebt ed- eda edb edd ede edg edi edo edr eds edt eea eeb eed eee eeg eeo eer ees eet ega egb egd ege egg egi ego egr egs egt eia eib eid eie eig eii eio eir eis eit eo- eoa eob eod eoe eog eoi eoo eor eos eot era erb erd ere erg eri ero err ers ert es- esa esb esd ese esg esi eso esr ess est eta etb etd ete etg eti eto etr ets ett g-d gaa gab gad gae gag gai gao gar gas gat gba gbd gbe gbg gbi gbo gbr gbs gbt gda gdb gdd gde gdi gdo gdr gds gdt ge- gea geb ged gee geg gei geo ger ges get gga ggb ggd ggg ggi ggo ggr ggs ggt gia gib gid gie gig gii gio gir gis git goa gob god goe gog goi goo gor gos got gra grb grd gre grg gri gro grr grs grt gsa gsb gsd gse gsg gsi gso gsr gss gst gta gtb gtd gte gtg gti gto gtr gts gtt i-d ia- iaa iab iad iae iag iai iao iar ias iat iba ibb ibd ibe ibg ibi ibo ibr ibs ibt ida idb idd ide idg idi ido idr ids idt ie- iea ied iee ieg iei ier ies iet iga igb igd ige igg igi igo igr igs igt iia iib iid iie iii iio iir iis iit io- ioa iob iod ioe iog ioi ioo ior ios iot ir- ira irb ird ire irg iri iro irr irs irt is- isa isb isd ise isg isi iso isr iss ist ita itb itd ite itg iti ito its itt o-i oaa oab oad oae oag oai oao oar oas oat ob- oba obb obd obe obg obi obo obr obs obt oda odb odd ode odg odi odo odr ods odt oea oeb oed oee oeg oei oeo oer oes oet oga ogd oge ogg ogi ogo ogs ogt oia oib oid oie oii oio oir ois oit oo- ooa oob ood oog ooi ooo oor oos oot or- ora orb ord ore org ori oro orr ors ort os- osa osb osd ose osg osi oso osr oss ost ot- ota otb otd ote otg oti oto otr ots ott ra- raa rab rad rae rag rai rao rar ras rat rba rbb rbd rbe rbg rbi rbo rbr rbs rbt rda rdb rdd rde rdg rdi rdo rdr rds rdt re- rea reb red ree reg rei reo rer res ret rga rgb rgd rge rgg rgi rgo rgr rgs rgt ria rib rid rie rig rii rio rir ris rit roa rob rod roe rog roi roo ror ros rot rra rrb rrd rrg rri rrr rrs rrt rsa rsb rsd rse rsg rsi rso rsr rss rst rta rtb rtd rte rtg rti rto rtr rts rtt saa sab sad sae sag sai sao sar sas sat sba sbb sbd sbe sbg sbi sbo sbr sbs sbt sda sdb sdd sde sdg sdi sdo sdr sds sdt se- sea seb sed see seg sei seo ser ses set sga sgb sgd sge sgg sgi sgo sgr sgs sgt sia sib sid sie sig sii sio sir sis sit soa sob sod soe sog soi soo sor sos sot sr- sra srb srd sre srg sri sro srr srs srt ss- ssa ssb ssd sse ssg ssi sso ssr sss sst sta stb std ste stg sti sto str sts stt taa tab tad tae tag tai tao tar tas tat tba tbb tbd tbe tbg tbi tbo tbr tbs tbt tda tdb tdd tde tdg tdi tdo tdr tds tdt te- tea teb ted tee teg tei teo ter tes tet tga tgb tge tgg tgi tgo tgr tgs tgt tia tib tid tie tig tii tio tir tis tit to- toa tob tod toe tog toi too tor tos tot tra trb trd tre trg tri tro