a-a a-b a-q aaa aab aad aan aaq aar ab- aba abb abd abn abq abr ad- ada adb add adn adq adr an- ana anb and ann anq anr aqa aqn aqr ar- ara arb ard arn arq arr baa bab bad ban baq bar bba bbb bbd bbn bbq bbr bda bdb bdd bdq bdr bna bnb bnd bnn bnr bqd bra brb brd brn brq brr daa dab dad dan daq dar dba dbb dbd dbn dbq dbr dda ddb ddd ddn ddq ddr dna dnb dnd dnn dnq dnr dqa dqn dra drb drd drn drq drr naa nab nad nan nar nba nbb nbd nbn nbr nda ndb ndd ndn ndr nna nnb nnn nra nrb nrd nrn nrr qaa qad qan qar qba qbd qbq qda qdb qdr qnb qnd qqq qra qrb ra- raa rab rad ran raq rar rba rbb rbd rbn rbr rda rdb rdd rdn rdr rna rnb rnd rnn rnr rqn rra rrb rrd rrn rrq rrr