a-a a-b a-i aaa aab aad aai aan aar ab- aba abb abd abi abn abr ad- ada adb add adi adn adr ai- aia aib aid aii ain air an- ana anb and ani ann anr ar- ara arb ard ari arn arr baa bab bad bai ban bar bba bbb bbd bbi bbn bbr bda bdb bdd bdi bdr bi- bia bib bid bii bin bir bna bnb bnd bni bnn bnr bra brb brd bri brn brr daa dab dad dai dan dar dba dbb dbd dbi dbn dbr dda ddb ddd ddi ddn ddr di- dia dib did dii din dir dna dnb dnd dni dnn dnr dra drb drd dri drn drr i-d ia- iaa iab iad iai ian iar iba ibb ibd ibi ibn ibr ida idb idd idi idn idr iia iib iid iii iin iir in- ina inb ind ini inn inr ir- ira irb ird iri irn irr n-i naa nab nad nai nan nar nba nbb nbd nbi nbn nbr nda ndb ndd ndi ndn ndr nia nib nid nii nin nir nna nnb nni nnn nra nrb nrd nri nrn nrr ra- raa rab rad rai ran rar rba rbb rbd rbi rbn rbr rda rdb rdd rdi rdn rdr ria rib rid rii rin rir rna rnb rnd rni rnn rnr rra rrb rrd rri rrn rrr