-er a-a a-b aaa aab aad aae aak aan aao aar aau ab- aba abb abd abe abk abn abo abr abu ad- ada adb add ade adk adn ado adr adu aea aeb aed aee aek aen aeo aer aeu aka akb akd ake akk akn ako akr aku an- ana anb and ane ank ann ano anr anu aoa aob aod aoe aok aon aoo aor aou ar- ara arb ard are ark arn aro arr aru au- aua aub aud aue auk aun auo aur b-u baa bab bad bae bak ban bao bar bau bba bbb bbd bbe bbk bbn bbo bbr bbu bda bdb bdd bde bdk bdo bdr bdu be- bea beb bed bee bek ben beo ber beu bka bkb bke bkk bkn bko bkr bna bnb bnd bne bnk bnn bno bnr bnu boa bob bod boe bok bon boo bor bou bra brb brd bre brk brn bro brr bru bua bub bud bue buk bun buo bur buu daa dab dad dae dak dan dao dar dau dba dbb dbd dbe dbk dbn dbo dbr dbu dda ddb ddd dde ddk ddn ddo ddr ddu de- dea deb ded dee dek den deo der deu dka dkb dke dkk dko dkr dku dna dnb dnd dne dnk dnn dno dnr doa dob dod doe dok don doo dor dou dra drb drd dre drk drn dro drr dru dua dub dud due duk dun duo dur eaa eab ead eae eak ean eao ear eau eba ebb ebd ebe ebk ebn ebo ebr ebu ed- eda edb edd ede edk edn edo edr edu eea eeb eed eee eek een eeo eer eka ekb ekd eke eko ekr eku en- ena enb end ene enk enn eno enr enu eo- eoa eob eod eoe eok eon eoo eor eou era erb erd ere erk ern ero err eru eu- eua eub eud eue eun eur ka- kaa kab kad kae kak kan kao kar kau kba kbb kbd kbe kbk kbn kbo kbr kbu kda kdb kde kdk kdo kdr kdu ke- kea keb ked kee kek ken keo ker kkb kke kkk kkn kkr kku kn- kna knd kne knk knn kno knr knu koa kob kod koe kok kon koo kor kou kra krd krk krn kro krr kru kub kud kue kuk kun kur kuu naa nab nad nae nak nan nao nar nau nba nbb nbd nbe nbk nbn nbo nbr nbu nda ndb ndd nde ndk ndn ndo ndr ndu ne- nea neb ned nee nek nen neo ner neu nka nke nkk nkn nko nkr nku nna nnb nne nnk nnn nno nnu no- noa nob nod noe nok non noo nor nou nra nrb nrd nre nrk nrn nro nrr nru nua nub nud nue nuk nun nuo nur nuu oaa oab oad oae oak oan oao oar oau ob- oba obb obd obe obk obn obo obr obu oda odb odd ode odn odo odr odu oea oeb oed oee oen oeo oer oka okb okd oke okk oko okr oku on- ona onb ond one onk onn ono onr onu oo- ooa oob ood ook oon ooo oor or- ora orb ord ore ork orn oro orr oru ou- oua oud oue ouk oun ouo our ra- raa rab rad rae rak ran rao rar rau rba rbb rbd rbe rbk rbn rbo rbr rbu rda rdb rdd rde rdn rdo rdr rdu re- rea reb red ree rek ren reo rer reu rkb rke rkk rko rku rna rnb rnd rnn rno rnr rnu roa rob rod roe rok ron roo ror rou rra rrb rrd rrk rrn rrr rru rua rub rud rue ruk run ruo rur ruu ua- uaa uab uad uae uak uan uao uar uau uba ubb ube ubk ubn ubo ubr ubu uda udb udd ude udk udn udo udr udu uea ueb ued uee uen uer uka ukb uke ukk ukn ukr uku un- una unb und une unk unn uno unr unu uoa uob uod uoe uok uon uoo uor ur- ura urb urd ure urk urn uro urr uru uua uue uun uur uuu