-er a-a a-b aaa aab aad aae aag aar aas aau ab- aba abb abd abe abg abr abs abu ad- ada adb add ade adg adr ads adu aea aeb aed aee aeg aer aes aeu ag- aga agb agd age agg agr ags agu ar- ara arb ard are arg arr ars aru as- asa asb asd ase asg asr ass asu au- aua aub aud aue aug aur aus b-u baa bab bad bae bag bar bas bau bba bbb bbd bbe bbg bbr bbs bbu bda bdb bdd bde bdg bdr bds bdu be- bea beb bed bee beg ber bes beu bga bgb bgd bge bgg bgr bgs bgu bra brb brd bre brg brr brs bru bsa bsb bsd bse bsg bsr bss bsu bua bub bud bue bug bur bus buu daa dab dad dae dag dar das dau dba dbb dbd dbe dbg dbr dbs dbu dda ddb ddd dde ddg ddr dds ddu de- dea deb ded dee deg der des deu dga dgd dge dgg dgr dgs dgu dra drb drd dre drg drr drs dru dsa dsb dsd dse dsg dsr dss dsu dua dub dud due dug dur dus eaa eab ead eae eag ear eas eau eba ebb ebd ebe ebg ebr ebs ebu ed- eda edb edd ede edg edr eds edu eea eeb eed eee eeg eer ees ega egb egd ege egg egr egs egu era erb erd ere erg err ers eru es- esa esb esd ese esg esr ess esu eu- eua eub eud eue eug eur eus g-d gaa gab gad gae gag gar gas gau gba gbd gbe gbg gbr gbs gbu gda gdb gdd gde gdr gds gdu ge- gea geb ged gee geg ger ges geu gga ggb ggd ggg ggr ggs ggu gra grb grd gre grg grr grs gru gsa gsb gsd gse gsg gsr gss gsu gu- gua gub gud gue gug gur gus guu ra- raa rab rad rae rag rar ras rau rba rbb rbd rbe rbg rbr rbs rbu rda rdb rdd rde rdg rdr rds rdu re- rea reb red ree reg rer res reu rga rgb rgd rge rgg rgr rgs rra rrb rrd rrg rrr rrs rru rsa rsb rsd rse rsg rsr rss rsu rua rub rud rue rug rur rus ruu saa sab sad sae sag sar sas sau sba sbb sbd sbe sbg sbr sbs sbu sda sdb sdd sde sdg sdr sds sdu se- sea seb sed see seg ser ses seu sga sgb sgd sge sgg sgr sgs sgu sr- sra srb srd sre srg srr srs ss- ssa ssb ssd sse ssg ssr sss ssu sua sub sud sue sug sur sus suu ua- uaa uab uad uae uag uar uas uau uba ubb ube ubg ubr ubs ubu uda udb udd ude udg udr uds udu uea ueb ued uee ueg uer ues uga ugb uge ugg ugr ugs ugu ur- ura urb urd ure urg urr urs uru usa usb usd use usg usr uss usu uua uue uug uur uus uuu