-er a-a a-b a-i a-t aaa aab aad aae aag aai aar aas aat ab- aba abb abd abe abg abi abr abs abt ad- ada adb add ade adg adi adr ads adt aea aeb aed aee aeg aei aer aes aet ag- aga agb agd age agg agi agr ags agt ai- aia aib aid aie aig aii air ais ait ar- ara arb ard are arg ari arr ars art as- asa asb asd ase asg asi asr ass ast at- ata atb atd ate atg ati atr ats att baa bab bad bae bag bai bar bas bat bba bbb bbd bbe bbg bbi bbr bbs bbt bda bdb bdd bde bdg bdi bdr bds bdt be- bea beb bed bee beg bei ber bes bet bga bgb bgd bge bgg bgi bgr bgs bgt bi- bia bib bid bie big bii bir bis bit bra brb brd bre brg bri brr brs brt bsa bsb bsd bse bsg bsi bsr bss bst bta btb btd bte btg bti btr bts btt daa dab dad dae dag dai dar das dat dba dbb dbd dbe dbg dbi dbr dbs dbt dda ddb ddd dde ddg ddi ddr dds ddt de- dea deb ded dee deg dei der des det dga dgd dge dgg dgi dgr dgs dgt di- dia dib did die dig dii dir dis dit dra drb drd dre drg dri drr drs drt dsa dsb dsd dse dsg dsi dsr dss dst dta dtb dtd dte dtg dti dtr dts dtt eaa eab ead eae eag eai ear eas eat eba ebb ebd ebe ebg ebi ebr ebs ebt ed- eda edb edd ede edg edi edr eds edt eea eeb eed eee eeg eer ees eet ega egb egd ege egg egi egr egs egt eia eib eid eie eig eii eir eis eit era erb erd ere erg eri err ers ert es- esa esb esd ese esg esi esr ess est eta etb etd ete etg eti etr ets ett g-d gaa gab gad gae gag gai gar gas gat gba gbd gbe gbg gbi gbr gbs gbt gda gdb gdd gde gdi gdr gds gdt ge- gea geb ged gee geg gei ger ges get gga ggb ggd ggg ggi ggr ggs ggt gia gib gid gie gig gii gir gis git gra grb grd gre grg gri grr grs grt gsa gsb gsd gse gsg gsi gsr gss gst gta gtb gtd gte gtg gti gtr gts gtt i-d ia- iaa iab iad iae iag iai iar ias iat iba ibb ibd ibe ibg ibi ibr ibs ibt ida idb idd ide idg idi idr ids idt ie- iea ied iee ieg iei ier ies iet iga igb igd ige igg igi igr igs igt iia iib iid iie iii iir iis iit ir- ira irb ird ire irg iri irr irs irt is- isa isb isd ise isg isi isr iss ist ita itb itd ite itg iti its itt ra- raa rab rad rae rag rai rar ras rat rba rbb rbd rbe rbg rbi rbr rbs rbt rda rdb rdd rde rdg rdi rdr rds rdt re- rea reb red ree reg rei rer res ret rga rgb rgd rge rgg rgi rgr rgs rgt ria rib rid rie rig rii rir ris rit rra rrb rrd rrg rri rrr rrs rrt rsa rsb rsd rse rsg rsi rsr rss rst rta rtb rtd rte rtg rti rtr rts rtt saa sab sad sae sag sai sar sas sat sba sbb sbd sbe sbg sbi sbr sbs sbt sda sdb sdd sde sdg sdi sdr sds sdt se- sea seb sed see seg sei ser ses set sga sgb sgd sge sgg sgi sgr sgs sgt sia sib sid sie sig sii sir sis sit sr- sra srb srd sre srg sri srr srs srt ss- ssa ssb ssd sse ssg ssi ssr sss sst sta stb std ste stg sti str sts stt taa tab tad tae tag tai tar tas tat tba tbb tbd tbe tbg tbi tbr tbs tbt tda tdb tdd tde tdg tdi tdr tds tdt te- tea teb ted tee teg tei ter tes tet tga tgb tge tgg tgi tgr tgs tgt tia tib tid tie tig tii tir tis tit tra trb trd tre trg tri trr trs trt tsa tsb tsd tse tsg tsi tsr tss tst tta ttb ttd tte ttg tti ttr tts ttt