a-a a-b a-c a-t aaa aab aac aad aae aaf aan aao aas aat aau ab- aba abb abc abd abe abf abn abo abs abt abu ac- aca acb acc acd ace acf acn aco acs act acu ad- ada adb adc add ade adf adn ado ads adt adu aea aeb aec aed aee aef aen aeo aes aet aeu af- afa afb afc afd afe aff afn afo afs aft afu an- ana anb anc and ane anf ann ano ans ant anu aoa aob aoc aod aoe aof aon aoo aos aot aou as- asa asb asc asd ase asf asn aso ass ast asu at- ata atb atc atd ate atf atn ato ats att atu au- aua aub auc aud aue auf aun auo aus aut b-u baa bab bac bad bae baf ban bao bas bat bau bba bbb bbc bbd bbe bbf bbn bbo bbs bbt bbu bca bcb bcc bcd bce bcf bcn bco bcs bct bcu bda bdb bdc bdd bde bdf bdo bds bdt bdu be- bea beb bec bed bee bef ben beo bes bet beu bfa bfb bfc bfd bfe bff bfn bfo bfs bft bfu bna bnb bnc bnd bne bnf bnn bno bns bnt bnu boa bob boc bod boe bof bon boo bos bot bou bsa bsb bsc bsd bse bsf bsn bso bss bst bsu bta btb btc btd bte btf btn bto bts btt btu bua bub buc bud bue buf bun buo bus but buu c-- caa cab cac cad cae caf can cao cas cat cau cba cbb cbc cbd cbe cbf cbn cbo cbs cbt cbu cca ccb ccc ccd cce ccf ccn cco ccs cct ccu cda cdb cdc cdd cde cdf cdn cdo cds cdt cdu ce- cea ceb cec ced cee cef cen ceo ces cet ceu cfa cfb cfc cfd cfe cff cfn cfo cfs cft cfu cn- cna cnb cnc cnd cne cnf cnn cno cns cnt cnu co- coa cob coc cod coe cof con coo cos cot cou csa csb csc csd cse csf csn cso css cst csu cta ctb ctc ctd cte ctf ctn cto cts ctt ctu cua cub cuc cud cue cuf cun cuo cus cut cuu daa dab dac dad dae daf dan dao das dat dau dba dbb dbc dbd dbe dbf dbn dbo dbs dbt dbu dca dcb dcc dcd dce dcf dcn dco dcs dct dcu dda ddb ddc ddd dde ddf ddn ddo dds ddt ddu de- dea deb dec ded dee def den deo des det deu dfa dfb dfc dfd dfe dff dfn dfo dfs dft dfu dna dnb dnc dnd dne dnf dnn dno dns dnt doa dob doc dod doe dof don doo dos dot dou dsa dsb dsc dsd dse dsf dsn dso dss dst dsu dta dtb dtc dtd dte dtf dtn dto dts dtt dtu dua dub duc dud due duf dun duo dus dut eaa eab eac ead eae eaf ean eao eas eat eau eba ebb ebc ebd ebe ebf ebn ebo ebs ebt ebu ec- eca ecb ecc ecd ece ecf ecn eco ecs ect ecu ed- eda edb edc edd ede edf edn edo eds edt edu eea eeb eec eed eee eef een eeo ees eet ef- efa efb efc efd efe eff efo efs eft en- ena enb enc end ene enf enn eno ens ent enu eo- eoa eob eoc eod eoe eof eon eoo eos eot eou es- esa esb esc esd ese esf esn eso ess est esu eta etb etc etd ete etf etn eto ets ett etu eu- eua eub euc eud eue euf eun eus eut faa fab fac fad fae faf fan fao fas fat fau fba fbb fbc fbd fbe fbf fbn fbo fbs fbt fbu fca fcb fcc fcd fce fcf fcn fco fcs fct fcu fda fdb fdc fdd fde fdf fdn fdo fds fdt fdu fea feb fec fed fee fef fen feo fes fet feu ffa ffc ffd ffe fff ffn ffo ffs fft ffu fna fnb fnc fnd fne fnf fnn fns fnt fnu foa fob foc foe fof fon foo fos fot fou fsa fsb fsc fsd fse fsf fsn fso fss fst fsu fta ftb ftc ftd fte ftf ftn fto fts ftt ftu fua fub fud fue fuf fun fuo fus fut fuu naa nab nac nad nae naf nan nao nas nat nau nba nbb nbc nbd nbe nbf nbn nbo nbs nbt nbu nca ncb ncc ncd nce ncf ncn nco ncs nct ncu nda ndb ndc ndd nde ndf ndn ndo nds ndt ndu ne- nea neb nec ned nee nef nen neo nes net neu nfa nfb nfc nfd nfe nff nfn nfo nfs nft nfu nna nnb nnc nne nnf nnn nno nns nnt nnu no- noa nob noc nod noe nof non noo nos not nou nsa nsb nsc nsd nse nsf nsn nso nss nst nsu nta ntb ntc ntd nte ntf ntn nto nts ntt ntu nua nub nuc nud nue nun nuo nus nut nuu oaa oab oac oad oae oaf oan oao oas oat oau ob- oba obb obc obd obe obf obn obo obs obt obu oc- oca ocb occ ocd ocf ocn oco ocs oct ocu oda odb odc odd ode odf odn odo ods odt odu oea oeb oec oed oee oef oen oeo oes oet of- ofa ofb ofc ofd ofe off ofn ofo ofs oft ofu on- ona onb onc ond one onf onn ono ons ont onu oo- ooa oob ooc ood oof oon ooo oos oot os- osa osb osc osd ose osf osn oso oss ost osu ot- ota otb otc otd ote otf otn oto ots ott otu ou- oua ouc oud oue ouf oun ouo ous out saa sab sac sad sae saf san sao sas sat sau sba sbb sbc sbd sbe sbf