-er a-a a-b aaa aab aad aae aam aan aap aar ab- aba abb abd abe abm abn abp abr ad- ada adb add ade adm adn adp adr aea aeb aed aee aem aen aep aer ama amb amd ame amm amn amp amr an- ana anb and ane anm ann anp anr ap- apa apb apd ape apm apn app apr ar- ara arb ard are arm arn arp arr b-p baa bab bad bae bam ban bap bar bba bbb bbd bbe bbm bbn bbp bbr bda bdb bdd bde bdm bdp bdr be- bea beb bed bee bem ben bep ber bma bmb bmd bme bmm bmn bmp bmr bna bnb bnd bne bnn bnp bnr bpa bpb bpd bpe bpm bpn bpp bpr bra brb brd bre brm brn brp brr daa dab dad dae dam dan dap dar dba dbb dbd dbe dbm dbn dbp dbr dda ddb ddd dde ddm ddn ddp ddr de- dea deb ded dee dem den dep der dma dmb dmd dme dmm dmn dmp dmr dna dnb dnd dne dnm dnn dnp dnr dpa dpb dpd dpe dpm dpn dpp dpr dra drb drd dre drm drn drp drr eaa eab ead eae eam ean eap ear eba ebb ebd ebe ebm ebn ebp ebr ed- eda edb edd ede edm edn edp edr eea eeb eed eee eem een eep eer em- ema emb emd eme emm emn emp emr en- ena enb end ene enm enn enp enr ep- epa epb epd epe epm epn epp epr era erb erd ere erm ern erp err m-r maa mab mad mae mam man map mar mba mbb mbd mbe mbm mbp mbr mda mdb mdd mde mdm mdn mdp mdr mea meb med mee mem men mep mer mma mmb mmd mme mmm mmn mmp mmr mna mnb mne mnm mnn mnp mnr mpa mpb mpd mpe mpm mpn mpp mpr mra mrb mrd mre mrm mrn mrp mrr naa nab nad nae nam nan nap nar nba nbb nbd nbe nbm nbn nbp nbr nda ndb ndd nde ndm ndn ndp ndr ne- nea neb ned nee nem nen nep ner nma nmb nmd nme nmm nmn nmp nmr nna nnb nne nnm nnn nnp npa npb npd npe npm npn npp npr nra nrb nrd nre nrm nrn nrp nrr p-p paa pab pad pae pam pan pap par pba pbb pbd pbe pbm pbn pbp pbr pda pdb pdd pde pdm pdn pdp pdr pea peb ped pee pem pen pep per pma pmb pmd pme pmm pmn pmp pmr pn- pna pnb pnd pne pnm pnn pnp pnr ppa ppb ppd ppe ppm ppn ppp ppr pra prb prd pre prm prn prp prr ra- raa rab rad rae ram ran rap rar rba rbb rbd rbe rbm rbn rbp rbr rda rdb rdd rde rdm rdn rdp rdr re- rea reb red ree rem ren rep rer rma rmb rmd rme rmm rmn rmp rmr rna rnb rnd rnm rnn rnp rnr rpa rpb rpd rpe rpm rpn rpp rpr rra rrb rrd rrm rrn rrp rrr