-er a-a a-b aaa aab aad aae aag aao aar aau ab- aba abb abd abe abg abo abr abu ad- ada adb add ade adg ado adr adu aea aeb aed aee aeg aeo aer aeu ag- aga agb agd age agg ago agr agu aoa aob aod aoe aog aoo aor aou ar- ara arb ard are arg aro arr aru au- aua aub aud aue aug auo aur b-u baa bab bad bae bag bao bar bau bba bbb bbd bbe bbg bbo bbr bbu bda bdb bdd bde bdg bdo bdr bdu be- bea beb bed bee beg beo ber beu bga bgb bgd bge bgg bgo bgr bgu boa bob bod boe bog boo bor bou bra brb brd bre brg bro brr bru bua bub bud bue bug buo bur buu daa dab dad dae dag dao dar dau dba dbb dbd dbe dbg dbo dbr dbu dda ddb ddd dde ddg ddo ddr ddu de- dea deb ded dee deg deo der deu dga dgd dge dgg dgr dgu doa dob dod doe dog doo dor dou dra drb drd dre drg dro drr dru dua dub dud due dug duo dur eaa eab ead eae eag eao ear eau eba ebb ebd ebe ebg ebo ebr ebu ed- eda edb edd ede edg edo edr edu eea eeb eed eee eeg eeo eer ega egb egd ege egg ego egr egu eo- eoa eob eod eoe eog eoo eor eou era erb erd ere erg ero err eru eu- eua eub eud eue eug eur g-d gaa gab gad gae gag gao gar gau gba gbd gbe gbg gbo gbr gbu gda gdb gdd gde gdo gdr gdu ge- gea geb ged gee geg geo ger geu gga ggb ggd ggg ggo ggr ggu goa gob god goe gog goo gor gou gra grb grd gre grg gro grr gru gu- gua gub gud gue gug guo gur guu oaa oab oad oae oag oao oar oau ob- oba obb obd obe obg obo obr obu oda odb odd ode odg odo odr odu oea oeb oed oee oeg oeo oer oga ogd oge ogg ogo oo- ooa oob ood oog ooo oor or- ora orb ord ore org oro orr oru ou- oua oud oue ouo our ra- raa rab rad rae rag rao rar rau rba rbb rbd rbe rbg rbo rbr rbu rda rdb rdd rde rdg rdo rdr rdu re- rea reb red ree reg reo rer reu rga rgb rgd rge rgg rgo rgr roa rob rod roe rog roo ror rou rra rrb rrd rrg rrr rru rua rub rud rue rug ruo rur ruu ua- uaa uab uad uae uag uao uar uau uba ubb ube ubg ubo ubr ubu uda udb udd ude udg udo udr udu uea ueb ued uee ueg uer uga ugb uge ugg ugo ugr ugu uoa uob uod uoe uog uoo uor ur- ura urb urd ure urg uro urr uru uua uue uug uur uuu