-er a-a a-b a-c a-t aaa aab aac aae aak aan aao aar aas aat aau ab- aba abb abc abe abk abn abo abr abs abt abu ac- aca acb acc ace ack acn aco acr acs act acu aea aeb aec aee aek aen aeo aer aes aet aeu aka akb akc ake akk akn ako akr aks aku an- ana anb anc ane ank ann ano anr ans ant anu aoa aob aoc aoe aok aon aoo aor aos aot aou ar- ara arb arc are ark arn aro arr ars art aru as- asa asb asc ase ask asn aso asr ass ast asu at- ata atb atc ate atn ato atr ats att atu au- aua aub auc aue auk aun auo aur aus aut b-u baa bab bac bae bak ban bao bar bas bat bau bba bbb bbc bbe bbk bbn bbo bbr bbs bbt bbu bca bcb bcc bce bck bcn bco bcr bcs bct bcu be- bea beb bec bee bek ben beo ber bes bet beu bka bkb bkc bke bkk bkn bko bkr bks bkt bna bnb bnc bne bnk bnn bno bnr bns bnt bnu boa bob boc boe bok bon boo bor bos bot bou bra brb bre brk brn bro brr brs brt bru bsa bsb bsc bse bsk bsn bso bsr bss bst bsu bta btb btc bte btk btn bto btr bts btt btu bua bub buc bue buk bun buo bur bus but buu c-- caa cab cac cae cak can cao car cas cat cau cba cbb cbc cbe cbk cbn cbo cbr cbs cbt cbu cca ccb ccc cce cck ccn cco ccr ccs cct ccu ce- cea ceb cec cee cek cen ceo cer ces cet ceu cka ckb ckc cko cks ckt cn- cna cnb cnc cne cnn cno cnr cns cnt cnu co- coa cob coc coe cok con coo cor cos cot cou cra crb crc cre crk crn cro crr crs crt cru csa csb csc cse csk csn cso csr css cst csu cta ctb ctc cte ctk ctn cto ctr cts ctt ctu cua cub cuc cue cuk cun cuo cur cus cut cuu eaa eab eac eae eak ean eao ear eas eat eau eba ebb ebc ebe ebk ebn ebo ebr ebs ebt ebu ec- eca ecb ecc ece eck ecn eco ecr ecs ect ecu eea eeb eec eee eek een eeo eer ees eet eka ekb ekc eke eko ekr eks ekt eku en- ena enb enc ene enk enn eno enr ens ent enu eo- eoa eob eoc eoe eok eon eoo eor eos eot eou era erb erc ere erk ern ero err ers ert eru es- esa esb esc ese esk esn eso esr ess est esu eta etb etc ete etk etn eto etr ets ett etu eu- eua eub euc eue eun eur eus eut k-t ka- kaa kab kac kae kak kan kao kar kas kat kau kba kbb kbc kbe kbk kbn kbo kbr kbs kbu kca kcb kcc kce kck kcn kcr kcs kct kcu ke- kea keb kec kee kek ken keo ker kes ket kkb kkc kke kkk kkn kkr kks kkt kku kn- kna knc kne knk knn kno knr knt knu koa kob koc koe kok kon koo kor kos kot kou kra krc krk krn kro krr krs krt kru ksa ksb ksc kse ksk ksn kso ksr kss kst ksu kta ktb ktc kte ktk ktn kto ktr kts ktt ktu kub kuc kue kuk kun kur kus kut kuu naa nab nac nae nak nan nao nar nas nat nau nba nbb nbc nbe nbk nbn nbo nbr nbs nbt nbu nca ncb ncc nce nck ncn nco ncr ncs nct ncu ne- nea neb nec nee nek nen neo ner nes net neu nka nkc nke nkk nkn nko nkr nks nkt nku nna nnb nnc nne nnk nnn nno nns nnt nnu no- noa nob noc noe nok non noo nor nos not nou nra nrb nrc nre nrk nrn nro nrr nrs nrt nru nsa nsb nsc nse nsk nsn nso nsr nss nst nsu nta ntb ntc nte ntk ntn nto ntr nts ntt ntu nua nub nuc nue nuk nun nuo nur nus nut nuu oaa oab oac oae oak oan oao oar oas oat oau ob- oba obb obc obe obk obn obo obr obs obt obu oc- oca ocb occ ock ocn oco ocr ocs oct ocu oea oeb oec oee oen oeo oer oes oet oka okb okc oke okk oko okr oks oku on- ona onb onc one onk onn ono onr ons ont onu oo- ooa oob ooc ook oon ooo oor oos oot or- ora orb orc ore ork orn oro orr ors ort oru os- osa osb osc ose osk osn oso osr oss ost osu ot- ota otb otc ote otk otn oto otr ots ott otu ou- oua ouc oue ouk oun ouo our ous out ra- raa rab rac rae rak ran rao rar ras rat rau rba rbb rbc rbe rbk rbn rbo rbr rbs rbt rbu rca rcb rcc rce rcn rco rcr rcs rct rcu re- rea reb rec ree rek ren reo rer res ret reu rkb rkc rke rkk rko rks rkt rku rna rnb rnc rnn rno rnr rns rnt rnu roa rob roc roe rok ron roo ror ros rot rou rra rrb rrc rrk rrn rrr rrs rrt rru rsa rsb rsc rse rsk rsn rso rsr rss rst rsu rta rtb rtc rte rtk rtn rto rtr rts rtt rtu rua rub ruc rue ruk run ruo rur rus rut ruu saa sab sac sae sak san sao sar sas sat sau sba sbb sbc sbe sbk sbn sbo sbr sbs sbt sbu sca scb scc sce sck scn sco scr scs sct scu se- sea seb sec see sek sen