-er a-a a-b a-c aaa aab aac aad aae aaf aak aan aao aar aau ab- aba abb abc abd abe abf abk abn abo abr abu ac- aca acb acc acd ace acf ack acn aco acr acu ad- ada adb adc add ade adf adk adn ado adr adu aea aeb aec aed aee aef aek aen aeo aer aeu af- afa afb afc afd afe aff afk afn afo afr afu aka akb akc akd ake akk akn ako akr aku an- ana anb anc and ane anf ank ann ano anr anu aoa aob aoc aod aoe aof aok aon aoo aor aou ar- ara arb arc ard are arf ark arn aro arr aru au- aua aub auc aud aue auf auk aun auo aur b-u baa bab bac bad bae baf bak ban bao bar bau bba bbb bbc bbd bbe bbf bbk bbn bbo bbr bbu bca bcb bcc bcd bce bcf bck bcn bco bcr bcu bda bdb bdc bdd bde bdf bdk bdo bdr bdu be- bea beb bec bed bee bef bek ben beo ber beu bfa bfb bfc bfd bfe bff bfn bfo bfr bfu bka bkb bkc bke bkf bkk bkn bko bkr bna bnb bnc bnd bne bnf bnk bnn bno bnr bnu boa bob boc bod boe bof bok bon boo bor bou bra brb brd bre brf brk brn bro brr bru bua bub buc bud bue buf buk bun buo bur buu c-- caa cab cac cad cae caf cak can cao car cau cba cbb cbc cbd cbe cbf cbk cbn cbo cbr cbu cca ccb ccc ccd cce ccf cck ccn cco ccr ccu cda cdb cdc cdd cde cdf cdk cdn cdo cdr cdu ce- cea ceb cec ced cee cef cek cen ceo cer ceu cfa cfb cfc cfd cfe cff cfk cfn cfo cfr cfu cka ckb ckc ckd cko cn- cna cnb cnc cnd cne cnf cnn cno cnr cnu co- coa cob coc cod coe cof cok con coo cor cou cra crb crc crd cre crf crk crn cro crr cru cua cub cuc cud cue cuf cuk cun cuo cur cuu daa dab dac dad dae daf dak dan dao dar dau dba dbb dbc dbd dbe dbf dbk dbn dbo dbr dbu dca dcb dcc dcd dce dcf dck dcn dco dcr dcu dda ddb ddc ddd dde ddf ddk ddn ddo ddr ddu de- dea deb dec ded dee def dek den deo der deu dfa dfb dfc dfd dfe dff dfk dfn dfo dfr dfu dka dkb dkc dke dkk dko dkr dku dna dnb dnc dnd dne dnf dnk dnn dno dnr doa dob doc dod doe dof dok don doo dor dou dra drb drc drd dre drk drn dro drr dru dua dub duc dud due duf duk dun duo dur eaa eab eac ead eae eaf eak ean eao ear eau eba ebb ebc ebd ebe ebf ebk ebn ebo ebr ebu ec- eca ecb ecc ecd ece ecf eck ecn eco ecr ecu ed- eda edb edc edd ede edf edk edn edo edr edu eea eeb eec eed eee eef eek een eeo eer ef- efa efb efc efd efe eff efo efr eka ekb ekc ekd eke ekf eko ekr eku en- ena enb enc end ene enf enk enn eno enr enu eo- eoa eob eoc eod eoe eof eok eon eoo eor eou era erb erc erd ere erf erk ern ero err eru eu- eua eub euc eud eue euf eun eur faa fab fac fad fae faf fak fan fao far fau fba fbb fbc fbd fbe fbf fbk fbn fbo fbr fbu fca fcb fcc fcd fce fcf fck fcn fco fcr fcu fda fdb fdc fdd fde fdf fdk fdn fdo fdr fdu fea feb fec fed fee fef fek fen feo fer feu ffa ffc ffd ffe fff ffk ffn ffo ffr ffu fka fkb fkc fkf fkk fna fnb fnc fnd fne fnf fnk fnn fnr fnu foa fob foc foe fof fok fon foo for fou fra frb frc frd fre frf frk frn fro frr fru fua fub fud fue fuf fuk fun fuo fur fuu ka- kaa kab kac kad kae kaf kak kan kao kar kau kba kbb kbc kbd kbe kbf kbk kbn kbo kbr kbu kca kcb kcc kcd kce kck kcn kcr kcu kda kdb kdc kde kdf kdk kdo kdr kdu ke- kea keb kec ked kee kef kek ken keo ker kfa kfc kfd kff kfo kfu kkb kkc kke kkk kkn kkr kku kn- kna knc knd kne knf knk knn kno knr knu koa kob koc kod koe kof kok kon koo kor kou kra krc krd krf krk krn kro krr kru kub kuc kud kue kuk kun kur kuu naa nab nac nad nae naf nak nan nao nar nau nba nbb nbc nbd nbe nbf nbk nbn nbo nbr nbu nca ncb ncc ncd nce ncf nck ncn nco ncr ncu nda ndb ndc ndd nde ndf ndk ndn ndo ndr ndu ne- nea neb nec ned nee nef nek nen neo ner neu nfa nfb nfc nfd nfe nff nfk nfn nfo nfr nfu nka nkc nke nkf nkk nkn nko nkr nku nna nnb nnc nne nnf nnk nnn nno nnu no- noa nob noc nod noe nof nok non noo nor nou nra nrb nrc nrd nre nrf nrk nrn nro nrr nru nua nub nuc nud nue nuk nun nuo nur nuu oaa oab oac oad oae oaf oak oan oao oar oau ob- oba obb obc obd obe obf obk obn obo obr obu oc- oca ocb occ ocd ocf ock ocn oco ocr ocu oda odb odc odd ode odf odn odo odr odu oea oeb oec oed oee oef oen oeo oer of- ofa ofb ofc ofd ofe off ofn ofo ofr ofu oka okb okc