a-a a-b a-i aaa aab aad aai aan aao aar aas ab- aba abb abd abi abn abo abr abs ad- ada adb add adi adn ado adr ads ai- aia aib aid aii ain aio air ais an- ana anb and ani ann ano anr ans aoa aob aod aoi aon aoo aor aos ar- ara arb ard ari arn aro arr ars as- asa asb asd asi asn aso asr ass baa bab bad bai ban bao bar bas bba bbb bbd bbi bbn bbo bbr bbs bda bdb bdd bdi bdo bdr bds bi- bia bib bid bii bin bio bir bis bna bnb bnd bni bnn bno bnr bns boa bob bod boi bon boo bor bos bra brb brd bri brn bro brr brs bsa bsb bsd bsi bsn bso bsr bss daa dab dad dai dan dao dar das dba dbb dbd dbi dbn dbo dbr dbs dda ddb ddd ddi ddn ddo ddr dds di- dia dib did dii din dio dir dis dna dnb dnd dni dnn dno dnr dns doa dob dod doi don doo dor dos dra drb drd dri drn dro drr drs dsa dsb dsd dsi dsn dso dsr dss i-d ia- iaa iab iad iai ian iao iar ias iba ibb ibd ibi ibn ibo ibr ibs ida idb idd idi idn ido idr ids iia iib iid iii iin iio iir iis in- ina inb ind ini inn ino inr ins io- ioa iob iod ioi ion ioo ior ios ir- ira irb ird iri irn iro irr irs is- isa isb isd isi isn iso isr iss n-i naa nab nad nai nan nao nar nas nba nbb nbd nbi nbn nbo nbr nbs nda ndb ndd ndi ndn ndo ndr nds nia nib nid nii nin nio nir nis nna nnb nni nnn nno nns no- noa nob nod noi non noo nor nos nra nrb nrd nri nrn nro nrr nrs nsa nsb nsd nsi nsn nso nsr nss o-i oaa oab oad oai oan oao oar oas ob- oba obb obd obi obn obo obr obs oda odb odd odi odn odo odr ods oia oib oid oii oin oio oir ois on- ona onb ond oni onn ono onr ons oo- ooa oob ood ooi oon ooo oor oos or- ora orb ord ori orn oro orr ors os- osa osb osd osi osn oso osr oss ra- raa rab rad rai ran rao rar ras rba rbb rbd rbi rbn rbo rbr rbs rda rdb rdd rdi rdn rdo rdr rds ria rib rid rii rin rio rir ris rna rnb rnd rni rnn rno rnr rns roa rob rod roi ron roo ror ros rra rrb rrd rri rrn rrr rrs rsa rsb rsd rsi rsn rso rsr rss saa sab sad sai san sao sar sas sba sbb sbd sbi sbn sbo sbr sbs sda sdb sdd sdi sdn sdo sdr sds sia sib sid sii sin sio sir sis sna snb snd sni snn sno snr sns soa sob sod soi son soo sor sos sr- sra srb srd sri srn sro srr srs ss- ssa ssb ssd ssi ssn sso ssr sss