a-a a-b a-i aaa aab aad aai aan aar aas ab- aba abb abd abi abn abr abs ad- ada adb add adi adn adr ads ai- aia aib aid aii ain air ais an- ana anb and ani ann anr ans ar- ara arb ard ari arn arr ars as- asa asb asd asi asn asr ass baa bab bad bai ban bar bas bba bbb bbd bbi bbn bbr bbs bda bdb bdd bdi bdr bds bi- bia bib bid bii bin bir bis bna bnb bnd bni bnn bnr bns bra brb brd bri brn brr brs bsa bsb bsd bsi bsn bsr bss daa dab dad dai dan dar das dba dbb dbd dbi dbn dbr dbs dda ddb ddd ddi ddn ddr dds di- dia dib did dii din dir dis dna dnb dnd dni dnn dnr dns dra drb drd dri drn drr drs dsa dsb dsd dsi dsn dsr dss i-d ia- iaa iab iad iai ian iar ias iba ibb ibd ibi ibn ibr ibs ida idb idd idi idn idr ids iia iib iid iii iin iir iis in- ina inb ind ini inn inr ins ir- ira irb ird iri irn irr irs is- isa isb isd isi isn isr iss n-i naa nab nad nai nan nar nas nba nbb nbd nbi nbn nbr nbs nda ndb ndd ndi ndn ndr nds nia nib nid nii nin nir nis nna nnb nni nnn nns nra nrb nrd nri nrn nrr nrs nsa nsb nsd nsi nsn nsr nss ra- raa rab rad rai ran rar ras rba rbb rbd rbi rbn rbr rbs rda rdb rdd rdi rdn rdr rds ria rib rid rii rin rir ris rna rnb rnd rni rnn rnr rns rra rrb rrd rri rrn rrr rrs rsa rsb rsd rsi rsn rsr rss saa sab sad sai san sar sas sba sbb sbd sbi sbn sbr sbs sda sdb sdd sdi sdn sdr sds sia sib sid sii sin sir sis sna snb snd sni snn snr sns sr- sra srb srd sri srn srr srs ss- ssa ssb ssd ssi ssn ssr sss