-er bbb bbd bbe bbn bbr bbt bdb bdd bde bdr bdt be- beb bed bee ben ber bet bnb bnd bne bnn bnr bnt brb brd bre brn brr brt btb btd bte btn btr btt dbb dbd dbe dbn dbr dbt ddb ddd dde ddn ddr ddt de- deb ded dee den der det dnb dnd dne dnn dnr dnt drb drd dre drn drr drt dtb dtd dte dtn dtr dtt ebb ebd ebe ebn ebr ebt ed- edb edd ede edn edr edt eeb eed eee een eer eet en- enb end ene enn enr ent erb erd ere ern err ert etb etd ete etn etr ett nbb nbd nbe nbn nbr nbt ndb ndd nde ndn ndr ndt ne- neb ned nee nen ner net nnb nne nnn nnt nrb nrd nre nrn nrr nrt ntb ntd nte ntn ntr ntt rbb rbd rbe rbn rbr rbt rdb rdd rde rdn rdr rdt re- reb red ree ren rer ret rnb rnd rnn rnr rnt rrb rrd rrn rrr rrt rtb rtd rte rtn rtr rtt tbb tbd tbe tbn tbr tbt tdb tdd tde tdn tdr tdt te- teb ted tee ten ter tet tnb tnd tne tnn tnr tnt trb trd tre trn trr trt ttb ttd tte ttn ttr ttt