-er a-a a-b a-t aaa aab aae aag aao aar aas aat aau ab- aba abb abe abg abo abr abs abt abu aea aeb aee aeg aeo aer aes aet aeu ag- aga agb age agg ago agr ags agt agu aoa aob aoe aog aoo aor aos aot aou ar- ara arb are arg aro arr ars art aru as- asa asb ase asg aso asr ass ast asu at- ata atb ate atg ato atr ats att atu au- aua aub aue aug auo aur aus aut b-u baa bab bae bag bao bar bas bat bau bba bbb bbe bbg bbo bbr bbs bbt bbu be- bea beb bee beg beo ber bes bet beu bga bgb bge bgg bgo bgr bgs bgt bgu boa bob boe bog boo bor bos bot bou bra brb bre brg bro brr brs brt bru bsa bsb bse bsg bso bsr bss bst bsu bta btb bte btg bto btr bts btt btu bua bub bue bug buo bur bus but buu eaa eab eae eag eao ear eas eat eau eba ebb ebe ebg ebo ebr ebs ebt ebu eea eeb eee eeg eeo eer ees eet ega egb ege egg ego egr egs egt egu eo- eoa eob eoe eog eoo eor eos eot eou era erb ere erg ero err ers ert eru es- esa esb ese esg eso esr ess est esu eta etb ete etg eto etr ets ett etu eu- eua eub eue eug eur eus eut gaa gab gae gag gao gar gas gat gau gba gbe gbg gbo gbr gbs gbt gbu ge- gea geb gee geg geo ger ges get geu gga ggb ggg ggo ggr ggs ggt ggu goa gob goe gog goo gor gos got gou gra grb gre grg gro grr grs grt gru gsa gsb gse gsg gso gsr gss gst gsu gta gtb gte gtg gto gtr gts gtt gtu gu- gua gub gue gug guo gur gus gut guu oaa oab oae oag oao oar oas oat oau ob- oba obb obe obg obo obr obs obt obu oea oeb oee oeg oeo oer oes oet oga oge ogg ogo ogs ogt oo- ooa oob oog ooo oor oos oot or- ora orb ore org oro orr ors ort oru os- osa osb ose osg oso osr oss ost osu ot- ota otb ote otg oto otr ots ott otu ou- oua oue ouo our ous out ra- raa rab rae rag rao rar ras rat rau rba rbb rbe rbg rbo rbr rbs rbt rbu re- rea reb ree reg reo rer res ret reu rga rgb rge rgg rgo rgr rgs rgt roa rob roe rog roo ror ros rot rou rra rrb rrg rrr rrs rrt rru rsa rsb rse rsg rso rsr rss rst rsu rta rtb rte rtg rto rtr rts rtt rtu rua rub rue rug ruo rur rus rut ruu saa sab sae sag sao sar sas sat sau sba sbb sbe sbg sbo sbr sbs sbt sbu se- sea seb see seg seo ser ses set seu sga sgb sge sgg sgo sgr sgs sgt sgu soa sob soe sog soo sor sos sot sou sr- sra srb sre srg sro srr srs srt ss- ssa ssb sse ssg sso ssr sss sst ssu sta stb ste stg sto str sts stt stu sua sub sue sug suo sur sus sut suu taa tab tae tag tao tar tas tat tau tba tbb tbe tbg tbo tbr tbs tbt tbu te- tea teb tee teg teo ter tes tet teu tga tgb tge tgg tgo tgr tgs tgt tgu to- toa tob toe tog too tor tos tot tou tra trb tre trg tro trr trs trt tru tsa tsb tse tsg tso tsr tss tst tsu tta ttb tte ttg tto ttr tts ttt ttu tua tub tue tug tuo tur tus tut tuu ua- uaa uab uae uag uao uar uas uat uau uba ubb ube ubg ubo ubr ubs ubt ubu uea ueb uee ueg uer ues uet uga ugb uge ugg ugo ugr ugs ugt ugu uoa uob uoe uog uoo uor uos uot ur- ura urb ure urg uro urr urs urt uru usa usb use usg uso usr uss ust usu uta utb ute uto utr uts utt utu uua uue uug uur uus uut uuu