-er a-a a-b a-c aaa aab aac aae aah aak aan aao aar aas aau ab- aba abb abc abe abh abk abn abo abr abs abu ac- aca acb acc ace ach ack acn aco acr acs acu aea aeb aec aee aeh aek aen aeo aer aes aeu aha ahb ahc ahe ahh ahk ahn aho ahr ahs ahu aka akb akc ake akh akk akn ako akr aks aku an- ana anb anc ane anh ank ann ano anr ans anu aoa aob aoc aoe aoh aok aon aoo aor aos aou ar- ara arb arc are arh ark arn aro arr ars aru as- asa asb asc ase ash ask asn aso asr ass asu au- aua aub auc aue auh auk aun auo aur aus b-u baa bab bac bae bah bak ban bao bar bas bau bba bbb bbc bbe bbh bbk bbn bbo bbr bbs bbu bca bcb bcc bce bch bck bcn bco bcr bcs bcu be- bea beb bec bee beh bek ben beo ber bes beu bha bhb bhc bhe bhh bhk bho bhr bhs bhu bka bkb bkc bke bkk bkn bko bkr bks bna bnb bnc bne bnk bnn bno bnr bns bnu boa bob boc boe boh bok bon boo bor bos bou bra brb bre brh brk brn bro brr brs bru bsa bsb bsc bse bsh bsk bsn bso bsr bss bsu bua bub buc bue buh buk bun buo bur bus buu c-- caa cab cac cae cah cak can cao car cas cau cba cbb cbc cbe cbh cbk cbn cbo cbr cbs cbu cca ccb ccc cce cch cck ccn cco ccr ccs ccu ce- cea ceb cec cee ceh cek cen ceo cer ces ceu ch- cha chb chc che chh chk chn cho chr chs chu cka ckb ckc ckh cko cks cn- cna cnb cnc cne cnh cnn cno cnr cns cnu co- coa cob coc coe coh cok con coo cor cos cou cra crb crc cre crh crk crn cro crr crs cru csa csb csc cse csh csk csn cso csr css csu cua cub cuc cue cuh cuk cun cuo cur cus cuu eaa eab eac eae eah eak ean eao ear eas eau eba ebb ebc ebe ebh ebk ebn ebo ebr ebs ebu ec- eca ecb ecc ece ech eck ecn eco ecr ecs ecu eea eeb eec eee eek een eeo eer ees eha ehb ehc ehe ehh ehn eho ehr ehs ehu eka ekb ekc eke ekh eko ekr eks eku en- ena enb enc ene enh enk enn eno enr ens enu eo- eoa eob eoc eoe eoh eok eon eoo eor eos eou era erb erc ere erh erk ern ero err ers eru es- esa esb esc ese esh esk esn eso esr ess esu eu- eua eub euc eue eun eur eus haa hab hac hae hah hak han hao har has hau hba hbb hbc hbe hbh hbk hbn hbo hbr hbs hbu hca hcb hcc hce hch hck hcn hco hcr hcs he- hea heb hec hee heh hek hen heo her hes heu hha hhb hhc hhe hhh hhk hhn hho hhr hhs hhu hka hkb hkh hkk hkn hko hkr hks hku hna hnb hnc hne hnh hnk hnn hno hns hnu hoa hob hoc hoe hoh hok hon hoo hor hos hou hr- hra hrb hrc hre hrh hrk hrn hro hrr hrs hru hsa hsb hsc hse hsh hsk hsn hsr hss hsu hua hub huc hue huh huk hun huo hur hus huu ka- kaa kab kac kae kah kak kan kao kar kas kau kba kbb kbc kbe kbh kbk kbn kbo kbr kbs kbu kca kcb kcc kce kch kck kcn kcr kcs kcu ke- kea keb kec kee keh kek ken keo ker kes kha khe khh khk khn kho khr khs khu kkb kkc kke kkh kkk kkn kkr kks kku kn- kna knc kne knk knn kno knr knu koa kob koc koe koh kok kon koo kor kos kou kra krc krk krn kro krr krs kru ksa ksb ksc kse ksh ksk ksn kso ksr kss ksu kub kuc kue kuh kuk kun kur kus kuu naa nab nac nae nah nak nan nao nar nas nau nba nbb nbc nbe nbk nbn nbo nbr nbs nbu nca ncb ncc nce nch nck ncn nco ncr ncs ncu ne- nea neb nec nee neh nek nen neo ner nes neu nha nhb nhc nhe nhh nhk nhn nhr nhs nhu nka nkc nke nkk nkn nko nkr nks nku nna nnb nnc nne nnh nnk nnn nno nns nnu no- noa nob noc noe noh nok non noo nor nos nou nra nrb nrc nre nrk nrn nro nrr nrs nru nsa nsb nsc nse nsh nsk nsn nso nsr nss nsu nua nub nuc nue nuh nuk nun nuo nur nus nuu oaa oab oac oae oah oak oan oao oar oas oau ob- oba obb obc obe obh obk obn obo obr obs obu oc- oca ocb occ och ock ocn oco ocr ocs ocu oea oeb oec oee oeh oen oeo oer oes oha ohc ohe ohh ohn oho ohr ohs ohu oka okb okc oke okk oko okr oks oku on- ona onb onc one onh onk onn ono onr ons onu oo- ooa oob ooc ooh ook oon ooo oor oos or- ora orb orc ore orh ork orn oro orr ors oru os- osa osb osc ose osh osk osn oso osr oss osu ou- oua ouc oue ouh ouk oun ouo our ous ra- raa rab rac rae rah rak ran rao rar ras rau rba rbb rbc rbe rbh rbk rbn rbo rbr rbs rbu rca rcb rcc rce rch rcn rco rcr rcs rcu re- rea reb rec ree reh rek ren reo rer res reu rh- rha rhb rhc rhe rhh rhn rho