-er a-a a-b aaa aab aad aae aaf aam aan aar ab- aba abb abd abe abf abm abn abr ad- ada adb add ade adf adm adn adr aea aeb aed aee aef aem aen aer af- afa afb afd afe aff afm afn afr ama amb amd ame amf amm amn amr an- ana anb and ane anf anm ann anr ar- ara arb ard are arf arm arn arr baa bab bad bae baf bam ban bar bba bbb bbd bbe bbf bbm bbn bbr bda bdb bdd bde bdf bdm bdr be- bea beb bed bee bef bem ben ber bfa bfb bfd bfe bff bfm bfn bfr bma bmb bmd bme bmf bmm bmn bmr bna bnb bnd bne bnf bnn bnr bra brb brd bre brf brm brn brr daa dab dad dae daf dam dan dar dba dbb dbd dbe dbf dbm dbn dbr dda ddb ddd dde ddf ddm ddn ddr de- dea deb ded dee def dem den der dfa dfb dfd dfe dff dfm dfn dfr dma dmb dmd dme dmf dmm dmn dmr dna dnb dnd dne dnf dnm dnn dnr dra drb drd dre drm drn drr eaa eab ead eae eaf eam ean ear eba ebb ebd ebe ebf ebm ebn ebr ed- eda edb edd ede edf edm edn edr eea eeb eed eee eef eem een eer ef- efa efb efd efe eff efm efr em- ema emb emd eme emf emm emn emr en- ena enb end ene enf enm enn enr era erb erd ere erf erm ern err faa fab fad fae faf fam fan far fba fbb fbd fbe fbf fbm fbn fbr fda fdb fdd fde fdf fdm fdn fdr fea feb fed fee fef fem fen fer ffa ffd ffe fff ffm ffn ffr fma fmb fmd fme fmf fmm fmn fmr fna fnb fnd fne fnf fnm fnn fnr fra frb frd fre frf frm frn frr m-f m-r maa mab mad mae maf mam man mar mba mbb mbd mbe mbf mbm mbr mda mdb mdd mde mdf mdm mdn mdr mea meb med mee mef mem men mer mfa mfb mfd mfe mff mfm mfn mfr mma mmb mmd mme mmf mmm mmn mmr mna mnb mne mnf mnm mnn mnr mra mrb mrd mre mrf mrm mrn mrr naa nab nad nae naf nam nan nar nba nbb nbd nbe nbf nbm nbn nbr nda ndb ndd nde ndf ndm ndn ndr ne- nea neb ned nee nef nem nen ner nfa nfb nfd nfe nff nfn nfr nma nmb nmd nme nmm nmn nmr nna nnb nne nnf nnm nnn nra nrb nrd nre nrf nrm nrn nrr ra- raa rab rad rae raf ram ran rar rba rbb rbd rbe rbf rbm rbn rbr rda rdb rdd rde rdf rdm rdn rdr re- rea reb red ree ref rem ren rer rfa rfb rfd rfe rff rfm rfn rfr rma rmb rmd rme rmf rmm rmn rmr rna rnb rnd rnm rnn rnr rra rrb rrd rrf rrm rrn rrr