a-a a-b a-c a-t aaa aab aac aae aaf aak aan aao aas aat aau ab- aba abb abc abe abf abk abn abo abs abt abu ac- aca acb acc ace acf ack acn aco acs act acu aea aeb aec aee aef aek aen aeo aes aet aeu af- afa afb afc afe aff afk afn afo afs aft afu aka akb akc ake akk akn ako aks aku an- ana anb anc ane anf ank ann ano ans ant anu aoa aob aoc aoe aof aok aon aoo aos aot aou as- asa asb asc ase asf ask asn aso ass ast asu at- ata atb atc ate atf atn ato ats att atu au- aua aub auc aue auf auk aun auo aus aut b-u baa bab bac bae baf bak ban bao bas bat bau bba bbb bbc bbe bbf bbk bbn bbo bbs bbt bbu bca bcb bcc bce bcf bck bcn bco bcs bct bcu be- bea beb bec bee bef bek ben beo bes bet beu bfa bfb bfc bfe bff bfn bfo bfs bft bfu bka bkb bkc bke bkf bkk bkn bko bks bkt bna bnb bnc bne bnf bnk bnn bno bns bnt bnu boa bob boc boe bof bok bon boo bos bot bou bsa bsb bsc bse bsf bsk bsn bso bss bst bsu bta btb btc bte btf btk btn bto bts btt btu bua bub buc bue buf buk bun buo bus but buu c-- caa cab cac cae caf cak can cao cas cat cau cba cbb cbc cbe cbf cbk cbn cbo cbs cbt cbu cca ccb ccc cce ccf cck ccn cco ccs cct ccu ce- cea ceb cec cee cef cek cen ceo ces cet ceu cfa cfb cfc cfe cff cfk cfn cfo cfs cft cfu cka ckb ckc cko cks ckt cn- cna cnb cnc cne cnf cnn cno cns cnt cnu co- coa cob coc coe cof cok con coo cos cot cou csa csb csc cse csf csk csn cso css cst csu cta ctb ctc cte ctf ctk ctn cto cts ctt ctu cua cub cuc cue cuf cuk cun cuo cus cut cuu eaa eab eac eae eaf eak ean eao eas eat eau eba ebb ebc ebe ebf ebk ebn ebo ebs ebt ebu ec- eca ecb ecc ece ecf eck ecn eco ecs ect ecu eea eeb eec eee eef eek een eeo ees eet ef- efa efb efc efe eff efo efs eft eka ekb ekc eke ekf eko eks ekt eku en- ena enb enc ene enf enk enn eno ens ent enu eo- eoa eob eoc eoe eof eok eon eoo eos eot eou es- esa esb esc ese esf esk esn eso ess est esu eta etb etc ete etf etk etn eto ets ett etu eu- eua eub euc eue euf eun eus eut faa fab fac fae faf fak fan fao fas fat fau fba fbb fbc fbe fbf fbk fbn fbo fbs fbt fbu fca fcb fcc fce fcf fck fcn fco fcs fct fcu fea feb fec fee fef fek fen feo fes fet feu ffa ffc ffe fff ffk ffn ffo ffs fft ffu fka fkb fkc fkf fkk fkt fna fnb fnc fne fnf fnk fnn fns fnt fnu foa fob foc foe fof fok fon foo fos fot fou fsa fsb fsc fse fsf fsk fsn fso fss fst fsu fta ftb ftc fte ftf ftk ftn fto fts ftt ftu fua fub fue fuf fuk fun fuo fus fut fuu k-t ka- kaa kab kac kae kaf kak kan kao kas kat kau kba kbb kbc kbe kbf kbk kbn kbo kbs kbu kca kcb kcc kce kck kcn kcs kct kcu ke- kea keb kec kee kef kek ken keo kes ket kfa kfc kff kfo kfs kfu kkb kkc kke kkk kkn kks kkt kku kn- kna knc kne knf knk knn kno knt knu koa kob koc koe kof kok kon koo kos kot kou ksa ksb ksc kse ksf ksk ksn kso kss kst ksu kta ktb ktc kte ktf ktk ktn kto kts ktt ktu kub kuc kue kuk kun kus kut kuu naa nab nac nae naf nak nan nao nas nat nau nba nbb nbc nbe nbf nbk nbn nbo nbs nbt nbu nca ncb ncc nce ncf nck ncn nco ncs nct ncu ne- nea neb nec nee nef nek nen neo nes net neu nfa nfb nfc nfe nff nfk nfn nfo nfs nft nfu nka nkc nke nkf nkk nkn nko nks nkt nku nna nnb nnc nne nnf nnk nnn nno nns nnt nnu no- noa nob noc noe nof nok non noo nos not nou nsa nsb nsc nse nsf nsk nsn nso nss nst nsu nta ntb ntc nte ntf ntk ntn nto nts ntt ntu nua nub nuc nue nuk nun nuo nus nut nuu oaa oab oac oae oaf oak oan oao oas oat oau ob- oba obb obc obe obf obk obn obo obs obt obu oc- oca ocb occ ocf ock ocn oco ocs oct ocu oea oeb oec oee oef oen oeo oes oet of- ofa ofb ofc ofe off ofn ofo ofs oft ofu oka okb okc oke okk oko oks oku on- ona onb onc one onf onk onn ono ons ont onu oo- ooa oob ooc oof ook oon ooo oos oot os- osa osb osc ose osf osk osn oso oss ost osu ot- ota otb otc ote otf otk otn oto ots ott otu ou- oua ouc oue ouf ouk oun ouo ous out saa sab sac sae saf sak san sao sas sat sau sba sbb sbc sbe sbf sbk sbn sbo sbs sbt sbu sca scb scc sce scf sck scn sco scs sct scu se- sea seb sec see sef sek sen seo ses set seu sfa sfb sfc sfe sff sfk sfn sfo sfs