-er a-a a-b aaa aab aad aae aag aar aau ab- aba abb abd abe abg abr abu ad- ada adb add ade adg adr adu aea aeb aed aee aeg aer aeu ag- aga agb agd age agg agr agu ar- ara arb ard are arg arr aru au- aua aub aud aue aug aur b-u baa bab bad bae bag bar bau bba bbb bbd bbe bbg bbr bbu bda bdb bdd bde bdg bdr bdu be- bea beb bed bee beg ber beu bga bgb bgd bge bgg bgr bgu bra brb brd bre brg brr bru bua bub bud bue bug bur buu daa dab dad dae dag dar dau dba dbb dbd dbe dbg dbr dbu dda ddb ddd dde ddg ddr ddu de- dea deb ded dee deg der deu dga dgd dge dgg dgr dgu dra drb drd dre drg drr dru dua dub dud due dug dur eaa eab ead eae eag ear eau eba ebb ebd ebe ebg ebr ebu ed- eda edb edd ede edg edr edu eea eeb eed eee eeg eer ega egb egd ege egg egr egu era erb erd ere erg err eru eu- eua eub eud eue eug eur g-d gaa gab gad gae gag gar gau gba gbd gbe gbg gbr gbu gda gdb gdd gde gdr gdu ge- gea geb ged gee geg ger geu gga ggb ggd ggg ggr ggu gra grb grd gre grg grr gru gu- gua gub gud gue gug gur guu ra- raa rab rad rae rag rar rau rba rbb rbd rbe rbg rbr rbu rda rdb rdd rde rdg rdr rdu re- rea reb red ree reg rer reu rga rgb rgd rge rgg rgr rra rrb rrd rrg rrr rru rua rub rud rue rug rur ruu ua- uaa uab uad uae uag uar uau uba ubb ube ubg ubr ubu uda udb udd ude udg udr udu uea ueb ued uee ueg uer uga ugb uge ugg ugr ugu ur- ura urb urd ure urg urr uru uua uue uug uur uuu