-er a-a a-b a-t a-z aaa aab aae aag aar aas aat aaz ab- aba abb abe abg abr abs abt abz aea aeb aee aeg aer aes aet aez ag- aga agb age agg agr ags agt agz ar- ara arb are arg arr ars art arz as- asa asb ase asg asr ass ast asz at- ata atb ate atg atr ats att atz az- aza azb aze azg azs azt azz baa bab bae bag bar bas bat baz bba bbb bbe bbg bbr bbs bbt be- bea beb bee beg ber bes bet bez bga bgb bge bgg bgr bgs bgt bgz bra brb bre brg brr brs brt brz bsa bsb bse bsg bsr bss bst bta btb bte btg btr bts btt btz bza bze bzr bzs bzz eaa eab eae eag ear eas eat eaz eba ebb ebe ebg ebr ebs ebt eea eeb eee eeg eer ees eet ega egb ege egg egr egs egt era erb ere erg err ers ert erz es- esa esb ese esg esr ess est eta etb ete etg etr ets ett etz eze ezr ezs ezz gaa gab gae gag gar gas gat gaz gba gbe gbg gbr gbs gbt gbz ge- gea geb gee geg ger ges get gez gga ggb ggg ggr ggs ggt ggz gra grb gre grg grr grs grt gsa gsb gse gsg gsr gss gst gta gtb gte gtg gtr gts gtt gza gzr ra- raa rab rae rag rar ras rat raz rba rbb rbe rbg rbr rbs rbt re- rea reb ree reg rer res ret rez rga rgb rge rgg rgr rgs rgt rra rrb rrg rrr rrs rrt rsa rsb rse rsg rsr rss rst rta rtb rte rtg rtr rts rtt rtz rza rzb rze saa sab sae sag sar sas sat saz sba sbb sbe sbg sbr sbs sbt se- sea seb see seg ser ses set sez sga sgb sge sgg sgr sgs sgt sr- sra srb sre srg srr srs srt ss- ssa ssb sse ssg ssr sss sst ssz sta stb ste stg str sts stt stz sza sze szr taa tab tae tag tar tas tat taz tba tbb tbe tbg tbr tbs tbt tbz te- tea teb tee teg ter tes tet tez tga tgb tge tgg tgr tgs tgt tgz tra trb tre trg trr trs trt trz tsa tsb tse tsg tsr tss tst tta ttb tte ttg ttr tts ttt tza tze tzs z-g zaa zab zag zar zas zat zaz zbb zbr zbs zbt zea zeb zee zer zes zet zez zgb zgg zgs zrs zsa zse zsg zst zsz zta zte ztr zzr zzs zzt zzz