a-a a-b aaa aab aad aam aan aar ab- aba abb abd abm abn abr ad- ada adb add adm adn adr ama amb amd amm amn amr an- ana anb and anm ann anr ar- ara arb ard arm arn arr baa bab bad bam ban bar bba bbb bbd bbm bbn bbr bda bdb bdd bdm bdr bma bmb bmd bmm bmn bmr bna bnb bnd bnn bnr bra brb brd brm brn brr daa dab dad dam dan dar dba dbb dbd dbm dbn dbr dda ddb ddd ddm ddn ddr dma dmb dmd dmm dmn dmr dna dnb dnd dnm dnn dnr dra drb drd drm drn drr m-r maa mab mad mam man mar mba mbb mbd mbm mbr mda mdb mdd mdm mdn mdr mma mmb mmd mmm mmn mmr mna mnb mnm mnn mnr mra mrb mrd mrm mrn mrr naa nab nad nam nan nar nba nbb nbd nbm nbn nbr nda ndb ndd ndm ndn ndr nma nmb nmd nmm nmn nmr nna nnb nnm nnn nra nrb nrd nrm nrn nrr ra- raa rab rad ram ran rar rba rbb rbd rbm rbn rbr rda rdb rdd rdm rdn rdr rma rmb rmd rmm rmn rmr rna rnb rnd rnm rnn rnr rra rrb rrd rrm rrn rrr