-er a-a a-b aaa aab aad aae aah aao aar aau ab- aba abb abd abe abh abo abr abu ad- ada adb add ade adh ado adr adu aea aeb aed aee aeh aeo aer aeu aha ahb ahd ahe ahh aho ahr ahu aoa aob aod aoe aoh aoo aor aou ar- ara arb ard are arh aro arr aru au- aua aub aud aue auh auo aur b-u baa bab bad bae bah bao bar bau bba bbb bbd bbe bbh bbo bbr bbu bda bdb bdd bde bdh bdo bdr bdu be- bea beb bed bee beh beo ber beu bha bhb bhd bhe bhh bho bhr bhu boa bob bod boe boh boo bor bou bra brb brd bre brh bro brr bru bua bub bud bue buh buo bur buu daa dab dad dae dah dao dar dau dba dbb dbd dbe dbh dbo dbr dbu dda ddb ddd dde ddh ddo ddr ddu de- dea deb ded dee deh deo der deu dh- dha dhb dhd dhe dhh dho dhr dhu doa dob dod doe doh doo dor dou dra drb drd dre dro drr dru dua dub dud due duh duo dur eaa eab ead eae eah eao ear eau eba ebb ebd ebe ebh ebo ebr ebu ed- eda edb edd ede edh edo edr edu eea eeb eed eee eeo eer eha ehb ehd ehe ehh eho ehr ehu eo- eoa eob eod eoe eoh eoo eor eou era erb erd ere erh ero err eru eu- eua eub eud eue eur haa hab had hae hah hao har hau hba hbb hbd hbe hbh hbo hbr hbu hda hdb hdd hde hdh hdo hdr hdu he- hea heb hed hee heh heo her heu hha hhb hhd hhe hhh hho hhr hhu hoa hob hod hoe hoh hoo hor hou hr- hra hrb hrd hre hrh hro hrr hru hua hub hud hue huh huo hur huu oaa oab oad oae oah oao oar oau ob- oba obb obd obe obh obo obr obu oda odb odd ode odh odo odr odu oea oeb oed oee oeh oeo oer oha ohd ohe ohh oho ohr ohu oo- ooa oob ood ooh ooo oor or- ora orb ord ore orh oro orr oru ou- oua oud oue ouh ouo our ra- raa rab rad rae rah rao rar rau rba rbb rbd rbe rbh rbo rbr rbu rda rdb rdd rde rdh rdo rdr rdu re- rea reb red ree reh reo rer reu rh- rha rhb rhd rhe rhh rho rhr rhu roa rob rod roe roh roo ror rou rra rrb rrd rrh rrr rru rua rub rud rue ruh ruo rur ruu ua- uaa uab uad uae uah uao uar uau uba ubb ube ubh ubo ubr ubu uda udb udd ude udo udr udu uea ueb ued uee ueh uer uha uhb uhd uhe uhh uho uhr uhu uoa uob uod uoe uoo uor ur- ura urb urd ure uro urr uru uua uue uur uuu