-er a-a a-b aaa aab aad aae aaf aao aar aau ab- aba abb abd abe abf abo abr abu ad- ada adb add ade adf ado adr adu aea aeb aed aee aef aeo aer aeu af- afa afb afd afe aff afo afr afu aoa aob aod aoe aof aoo aor aou ar- ara arb ard are arf aro arr aru au- aua aub aud aue auf auo aur b-u baa bab bad bae baf bao bar bau bba bbb bbd bbe bbf bbo bbr bbu bda bdb bdd bde bdf bdo bdr bdu be- bea beb bed bee bef beo ber beu bfa bfb bfd bfe bff bfo bfr bfu boa bob bod boe bof boo bor bou bra brb brd bre brf bro brr bru bua bub bud bue buf buo bur buu daa dab dad dae daf dao dar dau dba dbb dbd dbe dbf dbo dbr dbu dda ddb ddd dde ddf ddo ddr ddu de- dea deb ded dee def deo der deu dfa dfb dfd dfe dff dfo dfr dfu doa dob dod doe dof doo dor dou dra drb drd dre dro drr dru dua dub dud due duf duo dur eaa eab ead eae eaf eao ear eau eba ebb ebd ebe ebf ebo ebr ebu ed- eda edb edd ede edf edo edr edu eea eeb eed eee eef eeo eer ef- efa efb efd efe eff efo efr eo- eoa eob eod eoe eof eoo eor eou era erb erd ere erf ero err eru eu- eua eub eud eue euf eur faa fab fad fae faf fao far fau fba fbb fbd fbe fbf fbo fbr fbu fda fdb fdd fde fdf fdo fdr fdu fea feb fed fee fef feo fer feu ffa ffd ffe fff ffo ffr ffu foa fob foe fof foo for fou fra frb frd fre frf fro frr fru fua fub fud fue fuf fuo fur fuu oaa oab oad oae oaf oao oar oau ob- oba obb obd obe obf obo obr obu oda odb odd ode odf odo odr odu oea oeb oed oee oef oeo oer of- ofa ofb ofd ofe off ofo ofr ofu oo- ooa oob ood oof ooo oor or- ora orb ord ore orf oro orr oru ou- oua oud oue ouf ouo our ra- raa rab rad rae raf rao rar rau rba rbb rbd rbe rbf rbo rbr rbu rda rdb rdd rde rdf rdo rdr rdu re- rea reb red ree ref reo rer reu rfa rfb rfd rfe rff rfo rfr rfu roa rob rod roe rof roo ror rou rra rrb rrd rrf rrr rru rua rub rud rue ruf ruo rur ruu ua- uaa uab uad uae uaf uao uar uau uba ubb ube ubf ubo ubr ubu uda udb udd ude udf udo udr udu uea ueb ued uee uef uer ufa ufd ufe uff ufo ufr ufu uoa uob uod uoe uoo uor ur- ura urb urd ure urf uro urr uru uua uue uur uuu

a-be a-do a-fu aaaa aaab aaad aaae aaaf aaar aaba aabb aabd aada aade aadu aaea aafa aafb aafd aaff aaoe aaoo aara aard aare aaro aaru abaa abab abad abae abaf abar abau abb- abba abbb abbe abbo abbr abda abdo abdu abed abee aber abff aboa abob abod abof aboo abor abou abra abro abua abud abue abuf adaa adab adad adae adao adar adba adda addd adde addo addr addu adea adeb adee adeo ader adfa adob adod adoe adoo ador adra adre adro adua adub adue adur aeaf aede aeer aer- aera aerd aero afaa afad afao afar afdb afee afer affa affo afoa afoe afoo afor afr- afra afre afro afru afua afud afue aoba aoeu aora aorb aouf arab arad arae araf arar arau arba arbe arda arde ardf ardo ardu area ared aree aref areo areu arfa arfb arff arfu aroa arob arod aroe aroo aror arr- arra arre arro arrr arru arua arub arud arue auaa aube aude audo auer aufe aur- aura aurd aure auro baaa baad baaf baar baba babb babe babo babr babu bada badb badd bade bado badr badu baed baer baff bafo bar- bara barb bard bare barf baro barr baru bau- baud bauf baur bbad bbau bbbb bbdd bbdo bbeb bd-r bduf bead beaf bear beau beba bebb bebe bebo beda bede bedo bedu beeb beed beef beer befa befe beff befo beo- beod beof beor bera berd bere bero berr beru beur boab boad boar boba bobb bobe bobo bobu boda bodb bode bodo bodu boea boee boef boeo boer bofa bofd bofe boff bofu boob bood booe boof boor bor- bora bord bore borf boro borr boru boua boud boue bouf bour brab brad brae braf brao brau brda brdo brea breb bred bree bref breo brer brfu broa brob brod broe broo bror brou brrr brud brue buad buar buba bubb bube bubo bubu buda budb budd bude budo budu buea buer bueu bufe buff bufo bufr bur- bura burb burd bure buro burr buru d-bo daab daad daae daar daau daba dabb dabo dabu dada dade dado dadu daeb daer daeu dafa dafe daff dafo daou dara darb dard dare darf daro darr daru daub daud daue daur dbar dbfo dddd ddre ddub dead deae deaf dear deau deba debe debu deda dedd dede dedo dedu deeb deed deef deer defe deff defo deor der- dera derb dere derf dero derr deua deue deur dfaf dfer dffa dfoe dfrf doab doae doar doba dobb dobe dobu dod- doda dodd dode dodo doea doer doff doob dood doof door dora dord dore dorf doro dorr doru doub doud doue douf dour draa drab drad draf drar drau drba drda drea dred dree dref drob drod drof drou drra drua drub drue druu duaa duab duad duar dub- duba dubb dube dubu duda dudd dude dudo dudu duer duff dufu duo- dura dure duro