-er a-a a-b a-c a-t aaa aab aac aae aaf aak aao aar aas aat aau ab- aba abb abc abe abf abk abo abr abs abt abu ac- aca acb acc ace acf ack aco acr acs act acu aea aeb aec aee aef aek aeo aer aes aet aeu af- afa afb afc afe aff afk afo afr afs aft afu aka akb akc ake akk ako akr aks aku aoa aob aoc aoe aof aok aoo aor aos aot aou ar- ara arb arc are arf ark aro arr ars art aru as- asa asb asc ase asf ask aso asr ass ast asu at- ata atb atc ate atf ato atr ats att atu au- aua aub auc aue auf auk auo aur aus aut b-u baa bab bac bae baf bak bao bar bas bat bau bba bbb bbc bbe bbf bbk bbo bbr bbs bbt bbu bca bcb bcc bce bcf bck bco bcr bcs bct bcu be- bea beb bec bee bef bek beo ber bes bet beu bfa bfb bfc bfe bff bfo bfr bfs bft bfu bka bkb bkc bke bkf bkk bko bkr bks bkt boa bob boc boe bof bok boo bor bos bot bou bra brb bre brf brk bro brr brs brt bru bsa bsb bsc bse bsf bsk bso bsr bss bst bsu bta btb btc bte btf btk bto btr bts btt btu bua bub buc bue buf buk buo bur bus but buu c-- caa cab cac cae caf cak cao car cas cat cau cba cbb cbc cbe cbf cbk cbo cbr cbs cbt cbu cca ccb ccc cce ccf cck cco ccr ccs cct ccu ce- cea ceb cec cee cef cek ceo cer ces cet ceu cfa cfb cfc cfe cff cfk cfo cfr cfs cft cfu cka ckb ckc cko cks ckt co- coa cob coc coe cof cok coo cor cos cot cou cra crb crc cre crf crk cro crr crs crt cru csa csb csc cse csf csk cso csr css cst csu cta ctb ctc cte ctf ctk cto ctr cts ctt ctu cua cub cuc cue cuf cuk cuo cur cus cut cuu eaa eab eac eae eaf eak eao ear eas eat eau eba ebb ebc ebe ebf ebk ebo ebr ebs ebt ebu ec- eca ecb ecc ece ecf eck eco ecr ecs ect ecu eea eeb eec eee eef eek eeo eer ees eet ef- efa efb efc efe eff efo efr efs eft eka ekb ekc eke ekf eko ekr eks ekt eku eo- eoa eob eoc eoe eof eok eoo eor eos eot eou era erb erc ere erf erk ero err ers ert eru es- esa esb esc ese esf esk eso esr ess est esu eta etb etc ete etf etk eto etr ets ett etu eu- eua eub euc eue euf eur eus eut faa fab fac fae faf fak fao far fas fat fau fba fbb fbc fbe fbf fbk fbo fbr fbs fbt fbu fca fcb fcc fce fcf fck fco fcr fcs fct fcu fea feb fec fee fef fek feo fer fes fet feu ffa ffc ffe fff ffk ffo ffr ffs fft ffu fka fkb fkc fkf fkk fkt foa fob foc foe fof fok foo for fos fot fou fra frb frc fre frf frk fro frr frs frt fru fsa fsb fsc fse fsf fsk fso fsr fss fst fsu fta ftb ftc fte ftf ftk fto ftr fts ftt ftu fua fub fue fuf fuk fuo fur fus fut fuu k-t ka- kaa kab kac kae kaf kak kao kar kas kat kau kba kbb kbc kbe kbf kbk kbo kbr kbs kbu kca kcb kcc kce kck kcr kcs kct kcu ke- kea keb kec kee kef kek keo ker kes ket kfa kfc kff kfo kfs kfu kkb kkc kke kkk kkr kks kkt kku koa kob koc koe kof kok koo kor kos kot kou kra krc krf krk kro krr krs krt kru ksa ksb ksc kse ksf ksk kso ksr kss kst ksu kta ktb ktc kte ktf ktk kto ktr kts ktt ktu kub kuc kue kuk kur kus kut kuu oaa oab oac oae oaf oak oao oar oas oat oau ob- oba obb obc obe obf obk obo obr obs obt obu oc- oca ocb occ ocf ock oco ocr ocs oct ocu oea oeb oec oee oef oeo oer oes oet of- ofa ofb ofc ofe off ofo ofr ofs oft ofu oka okb okc oke okk oko okr oks oku oo- ooa oob ooc oof ook ooo oor oos oot or- ora orb orc ore orf ork oro orr ors ort oru os- osa osb osc ose osf osk oso osr oss ost osu ot- ota otb otc ote otf otk oto otr ots ott otu ou- oua ouc oue ouf ouk ouo our ous out ra- raa rab rac rae raf rak rao rar ras rat rau rba rbb rbc rbe rbf rbk rbo rbr rbs rbt rbu rca rcb rcc rce rcf rco rcr rcs rct rcu re- rea reb rec ree ref rek reo rer res ret reu rfa rfb rfc rfe rff rfk rfo rfr rfs rft rfu rkb rkc rke rkf rkk rko rks rkt rku roa rob roc roe rof rok roo ror ros rot rou rra rrb rrc rrf rrk rrr rrs rrt rru rsa rsb rsc rse rsf rsk rso rsr rss rst rsu rta rtb rtc rte rtf rtk rto rtr rts rtt rtu rua rub ruc rue ruf ruk ruo rur rus rut ruu saa sab sac sae saf sak sao sar sas sat sau sba sbb sbc sbe sbf sbk sbo sbr sbs sbt sbu sca scb scc sce scf sck sco scr scs sct scu se- sea seb sec see sef sek seo ser ses set seu sfa sfb sfc sfe sff sfk sfo sfr sfs sft