a-a a-b aaa aab aad aaf aam aan aar ab- aba abb abd abf abm abn abr ad- ada adb add adf adm adn adr af- afa afb afd aff afm afn afr ama amb amd amf amm amn amr an- ana anb and anf anm ann anr ar- ara arb ard arf arm arn arr baa bab bad baf bam ban bar bba bbb bbd bbf bbm bbn bbr bda bdb bdd bdf bdm bdr bfa bfb bfd bff bfm bfn bfr bma bmb bmd bmf bmm bmn bmr bna bnb bnd bnf bnn bnr bra brb brd brf brm brn brr daa dab dad daf dam dan dar dba dbb dbd dbf dbm dbn dbr dda ddb ddd ddf ddm ddn ddr dfa dfb dfd dff dfm dfn dfr dma dmb dmd dmf dmm dmn dmr dna dnb dnd dnf dnm dnn dnr dra drb drd drm drn drr faa fab fad faf fam fan far fba fbb fbd fbf fbm fbn fbr fda fdb fdd fdf fdm fdn fdr ffa ffd fff ffm ffn ffr fma fmb fmd fmf fmm fmn fmr fna fnb fnd fnf fnm fnn fnr fra frb frd frf frm frn frr m-f m-r maa mab mad maf mam man mar mba mbb mbd mbf mbm mbr mda mdb mdd mdf mdm mdn mdr mfa mfb mfd mff mfm mfn mfr mma mmb mmd mmf mmm mmn mmr mna mnb mnf mnm mnn mnr mra mrb mrd mrf mrm mrn mrr naa nab nad naf nam nan nar nba nbb nbd nbf nbm nbn nbr nda ndb ndd ndf ndm ndn ndr nfa nfb nfd nff nfn nfr nma nmb nmd nmm nmn nmr nna nnb nnf nnm nnn nra nrb nrd nrf nrm nrn nrr ra- raa rab rad raf ram ran rar rba rbb rbd rbf rbm rbn rbr rda rdb rdd rdf rdm rdn rdr rfa rfb rfd rff rfm rfn rfr rma rmb rmd rmf rmm rmn rmr rna rnb rnd rnm rnn rnr rra rrb rrd rrf rrm rrn rrr