-er b-p bbb bbd bbe bbn bbp bbr bdb bdd bde bdp bdr be- beb bed bee ben bep ber bnb bnd bne bnn bnp bnr bpb bpd bpe bpn bpp bpr brb brd bre brn brp brr dbb dbd dbe dbn dbp dbr ddb ddd dde ddn ddp ddr de- deb ded dee den dep der dnb dnd dne dnn dnp dnr dpb dpd dpe dpn dpp dpr drb drd dre drn drp drr ebb ebd ebe ebn ebp ebr ed- edb edd ede edn edp edr eeb eed eee een eep eer en- enb end ene enn enp enr ep- epb epd epe epn epp epr erb erd ere ern erp err nbb nbd nbe nbn nbp nbr ndb ndd nde ndn ndp ndr ne- neb ned nee nen nep ner nnb nne nnn nnp npb npd npe npn npp npr nrb nrd nre nrn nrp nrr p-p pbb pbd pbe pbn pbp pbr pdb pdd pde pdn pdp pdr peb ped pee pen pep per pn- pnb pnd pne pnn pnp pnr ppb ppd ppe ppn ppp ppr prb prd pre prn prp prr rbb rbd rbe rbn rbp rbr rdb rdd rde rdn rdp rdr re- reb red ree ren rep rer rnb rnd rnn rnp rnr rpb rpd rpe rpn rpp rpr rrb rrd rrn rrp rrr