-er a-a a-b a-t aaa aab aad aae aag aar aat aau ab- aba abb abd abe abg abr abt abu ad- ada adb add ade adg adr adt adu aea aeb aed aee aeg aer aet aeu ag- aga agb agd age agg agr agt agu ar- ara arb ard are arg arr art aru at- ata atb atd ate atg atr att atu au- aua aub aud aue aug aur aut b-u baa bab bad bae bag bar bat bau bba bbb bbd bbe bbg bbr bbt bbu bda bdb bdd bde bdg bdr bdt bdu be- bea beb bed bee beg ber bet beu bga bgb bgd bge bgg bgr bgt bgu bra brb brd bre brg brr brt bru bta btb btd bte btg btr btt btu bua bub bud bue bug bur but buu daa dab dad dae dag dar dat dau dba dbb dbd dbe dbg dbr dbt dbu dda ddb ddd dde ddg ddr ddt ddu de- dea deb ded dee deg der det deu dga dgd dge dgg dgr dgt dgu dra drb drd dre drg drr drt dru dta dtb dtd dte dtg dtr dtt dtu dua dub dud due dug dur dut eaa eab ead eae eag ear eat eau eba ebb ebd ebe ebg ebr ebt ebu ed- eda edb edd ede edg edr edt edu eea eeb eed eee eeg eer eet ega egb egd ege egg egr egt egu era erb erd ere erg err ert eru eta etb etd ete etg etr ett etu eu- eua eub eud eue eug eur eut g-d gaa gab gad gae gag gar gat gau gba gbd gbe gbg gbr gbt gbu gda gdb gdd gde gdr gdt gdu ge- gea geb ged gee geg ger get geu gga ggb ggd ggg ggr ggt ggu gra grb grd gre grg grr grt gru gta gtb gtd gte gtg gtr gtt gtu gu- gua gub gud gue gug gur gut guu ra- raa rab rad rae rag rar rat rau rba rbb rbd rbe rbg rbr rbt rbu rda rdb rdd rde rdg rdr rdt rdu re- rea reb red ree reg rer ret reu rga rgb rgd rge rgg rgr rgt rra rrb rrd rrg rrr rrt rru rta rtb rtd rte rtg rtr rtt rtu rua rub rud rue rug rur rut ruu taa tab tad tae tag tar tat tau tba tbb tbd tbe tbg tbr tbt tbu tda tdb tdd tde tdg tdr tdt tdu te- tea teb ted tee teg ter tet teu tga tgb tge tgg tgr tgt tgu tra trb trd tre trg trr trt tru tta ttb ttd tte ttg ttr ttt ttu tua tub tud tue tug tur tut tuu ua- uaa uab uad uae uag uar uat uau uba ubb ube ubg ubr ubt ubu uda udb udd ude udg udr udt udu uea ueb ued uee ueg uer uet uga ugb uge ugg ugr ugt ugu ur- ura urb urd ure urg urr urt uru uta utb utd ute utr utt utu uua uue uug uur uut uuu