a-a a-b a-i aaa aab aad aae aaf aai aan aas ab- aba abb abd abe abf abi abn abs ad- ada adb add ade adf adi adn ads aea aeb aed aee aef aei aen aes af- afa afb afd afe aff afi afn afs ai- aia aib aid aie aif aii ain ais an- ana anb and ane anf ani ann ans as- asa asb asd ase asf asi asn ass baa bab bad bae baf bai ban bas bba bbb bbd bbe bbf bbi bbn bbs bda bdb bdd bde bdf bdi bds be- bea beb bed bee bef bei ben bes bfa bfb bfd bfe bff bfi bfn bfs bi- bia bib bid bie bif bii bin bis bna bnb bnd bne bnf bni bnn bns bsa bsb bsd bse bsf bsi bsn bss daa dab dad dae daf dai dan das dba dbb dbd dbe dbf dbi dbn dbs dda ddb ddd dde ddf ddi ddn dds de- dea deb ded dee def dei den des dfa dfb dfd dfe dff dfi dfn dfs di- dia dib did die dif dii din dis dna dnb dnd dne dnf dni dnn dns dsa dsb dsd dse dsf dsi dsn dss eaa eab ead eae eaf eai ean eas eba ebb ebd ebe ebf ebi ebn ebs ed- eda edb edd ede edf edi edn eds eea eeb eed eee eef een ees ef- efa efb efd efe eff efi efs eia eib eid eie eif eii ein eis en- ena enb end ene enf eni enn ens es- esa esb esd ese esf esi esn ess faa fab fad fae faf fai fan fas fba fbb fbd fbe fbf fbi fbn fbs fda fdb fdd fde fdf fdi fdn fds fea feb fed fee fef fei fen fes ffa ffd ffe fff ffi ffn ffs fia fib fid fie fif fii fin fis fna fnb fnd fne fnf fni fnn fns fsa fsb fsd fse fsf fsi fsn fss i-d i-f ia- iaa iab iad iae iaf iai ian ias iba ibb ibd ibe ibf ibi ibn ibs ida idb idd ide idf idi idn ids ie- iea ied iee ief iei ien ies ifa ifb ifd ife iff ifi ifn ifs iia iib iid iie iif iii iin iis in- ina inb ind ine inf ini inn ins is- isa isb isd ise isf isi isn iss n-i naa nab nad nae naf nai nan nas nba nbb nbd nbe nbf nbi nbn nbs nda ndb ndd nde ndf ndi ndn nds ne- nea neb ned nee nef nei nen nes nfa nfb nfd nfe nff nfi nfn nfs nia nib nid nie nif nii nin nis nna nnb nne nnf nni nnn nns nsa nsb nsd nse nsf nsi nsn nss saa sab sad sae saf sai san sas sba sbb sbd sbe sbf sbi sbn sbs sda sdb sdd sde sdf sdi sdn sds se- sea seb sed see sef sei sen ses sfa sfb sfd sfe sff sfi sfn sfs sia sib sid sie sif sii sin sis sna snb snd sne snf sni snn sns ss- ssa ssb ssd sse ssf ssi ssn sss