a-a a-b a-i aaa aab aad aai aan aao aas ab- aba abb abd abi abn abo abs ad- ada adb add adi adn ado ads ai- aia aib aid aii ain aio ais an- ana anb and ani ann ano ans aoa aob aod aoi aon aoo aos as- asa asb asd asi asn aso ass baa bab bad bai ban bao bas bba bbb bbd bbi bbn bbo bbs bda bdb bdd bdi bdo bds bi- bia bib bid bii bin bio bis bna bnb bnd bni bnn bno bns boa bob bod boi bon boo bos bsa bsb bsd bsi bsn bso bss daa dab dad dai dan dao das dba dbb dbd dbi dbn dbo dbs dda ddb ddd ddi ddn ddo dds di- dia dib did dii din dio dis dna dnb dnd dni dnn dno dns doa dob dod doi don doo dos dsa dsb dsd dsi dsn dso dss i-d ia- iaa iab iad iai ian iao ias iba ibb ibd ibi ibn ibo ibs ida idb idd idi idn ido ids iia iib iid iii iin iio iis in- ina inb ind ini inn ino ins io- ioa iob iod ioi ion ioo ios is- isa isb isd isi isn iso iss n-i naa nab nad nai nan nao nas nba nbb nbd nbi nbn nbo nbs nda ndb ndd ndi ndn ndo nds nia nib nid nii nin nio nis nna nnb nni nnn nno nns no- noa nob nod noi non noo nos nsa nsb nsd nsi nsn nso nss o-i oaa oab oad oai oan oao oas ob- oba obb obd obi obn obo obs oda odb odd odi odn odo ods oia oib oid oii oin oio ois on- ona onb ond oni onn ono ons oo- ooa oob ood ooi oon ooo oos os- osa osb osd osi osn oso oss saa sab sad sai san sao sas sba sbb sbd sbi sbn sbo sbs sda sdb sdd sdi sdn sdo sds sia sib sid sii sin sio sis sna snb snd sni snn sno sns soa sob sod soi son soo sos ss- ssa ssb ssd ssi ssn sso sss