a-a a-b a-i aaa aab aad aaf aai aan aas ab- aba abb abd abf abi abn abs ad- ada adb add adf adi adn ads af- afa afb afd aff afi afn afs ai- aia aib aid aif aii ain ais an- ana anb and anf ani ann ans as- asa asb asd asf asi asn ass baa bab bad baf bai ban bas bba bbb bbd bbf bbi bbn bbs bda bdb bdd bdf bdi bds bfa bfb bfd bff bfi bfn bfs bi- bia bib bid bif bii bin bis bna bnb bnd bnf bni bnn bns bsa bsb bsd bsf bsi bsn bss daa dab dad daf dai dan das dba dbb dbd dbf dbi dbn dbs dda ddb ddd ddf ddi ddn dds dfa dfb dfd dff dfi dfn dfs di- dia dib did dif dii din dis dna dnb dnd dnf dni dnn dns dsa dsb dsd dsf dsi dsn dss faa fab fad faf fai fan fas fba fbb fbd fbf fbi fbn fbs fda fdb fdd fdf fdi fdn fds ffa ffd fff ffi ffn ffs fia fib fid fif fii fin fis fna fnb fnd fnf fni fnn fns fsa fsb fsd fsf fsi fsn fss i-d i-f ia- iaa iab iad iaf iai ian ias iba ibb ibd ibf ibi ibn ibs ida idb idd idf idi idn ids ifa ifb ifd iff ifi ifn ifs iia iib iid iif iii iin iis in- ina inb ind inf ini inn ins is- isa isb isd isf isi isn iss n-i naa nab nad naf nai nan nas nba nbb nbd nbf nbi nbn nbs nda ndb ndd ndf ndi ndn nds nfa nfb nfd nff nfi nfn nfs nia nib nid nif nii nin nis nna nnb nnf nni nnn nns nsa nsb nsd nsf nsi nsn nss saa sab sad saf sai san sas sba sbb sbd sbf sbi sbn sbs sda sdb sdd sdf sdi sdn sds sfa sfb sfd sff sfi sfn sfs sia sib sid sif sii sin sis sna snb snd snf sni snn sns ss- ssa ssb ssd ssf ssi ssn sss