a-a a-b a-i aaa aab aad aaf aai aan aao aas ab- aba abb abd abf abi abn abo abs ad- ada adb add adf adi adn ado ads af- afa afb afd aff afi afn afo afs ai- aia aib aid aif aii ain aio ais an- ana anb and anf ani ann ano ans aoa aob aod aof aoi aon aoo aos as- asa asb asd asf asi asn aso ass baa bab bad baf bai ban bao bas bba bbb bbd bbf bbi bbn bbo bbs bda bdb bdd bdf bdi bdo bds bfa bfb bfd bff bfi bfn bfo bfs bi- bia bib bid bif bii bin bio bis bna bnb bnd bnf bni bnn bno bns boa bob bod bof boi bon boo bos bsa bsb bsd bsf bsi bsn bso bss daa dab dad daf dai dan dao das dba dbb dbd dbf dbi dbn dbo dbs dda ddb ddd ddf ddi ddn ddo dds dfa dfb dfd dff dfi dfn dfo dfs di- dia dib did dif dii din dio dis dna dnb dnd dnf dni dnn dno dns doa dob dod dof doi don doo dos dsa dsb dsd dsf dsi dsn dso dss faa fab fad faf fai fan fao fas fba fbb fbd fbf fbi fbn fbo fbs fda fdb fdd fdf fdi fdn fdo fds ffa ffd fff ffi ffn ffo ffs fia fib fid fif fii fin fis fna fnb fnd fnf fni fnn fns foa fob fof foi fon foo fos fsa fsb fsd fsf fsi fsn fso fss i-d i-f ia- iaa iab iad iaf iai ian iao ias iba ibb ibd ibf ibi ibn ibo ibs ida idb idd idf idi idn ido ids ifa ifb ifd iff ifi ifn ifo ifs iia iib iid iif iii iin iio iis in- ina inb ind inf ini inn ino ins io- ioa iob iod iof ioi ion ioo ios is- isa isb isd isf isi isn iso iss n-i naa nab nad naf nai nan nao nas nba nbb nbd nbf nbi nbn nbo nbs nda ndb ndd ndf ndi ndn ndo nds nfa nfb nfd nff nfi nfn nfo nfs nia nib nid nif nii nin nio nis nna nnb nnf nni nnn nno nns no- noa nob nod nof noi non noo nos nsa nsb nsd nsf nsi nsn nso nss o-i oaa oab oad oaf oai oan oao oas ob- oba obb obd obf obi obn obo obs oda odb odd odf odi odn odo ods of- ofa ofb ofd off ofi ofn ofo ofs oia oib oid oif oii oin oio ois on- ona onb ond onf oni onn ono ons oo- ooa oob ood oof ooi oon ooo oos os- osa osb osd osf osi osn oso oss saa sab sad saf sai san sao sas sba sbb sbd sbf sbi sbn sbo sbs sda sdb sdd sdf sdi sdn sdo sds sfa sfb sfd sff sfi sfn sfo sfs sia sib sid sif sii sin sio sis sna snb snd snf sni snn sno sns soa sob sod sof soi son soo sos ss- ssa ssb ssd ssf ssi ssn sso sss