-er bbb bbd bbe bbg bbn bbr bdb bdd bde bdg bdr be- beb bed bee beg ben ber bgb bgd bge bgg bgn bgr bnb bnd bne bng bnn bnr brb brd bre brg brn brr dbb dbd dbe dbg dbn dbr ddb ddd dde ddg ddn ddr de- deb ded dee deg den der dgd dge dgg dgn dgr dnb dnd dne dng dnn dnr drb drd dre drg drn drr ebb ebd ebe ebg ebn ebr ed- edb edd ede edg edn edr eeb eed eee eeg een eer egb egd ege egg egn egr en- enb end ene eng enn enr erb erd ere erg ern err g-d gbd gbe gbg gbn gbr gdb gdd gde gdn gdr ge- geb ged gee geg gen ger ggb ggd ggg ggn ggr gnb gnd gne gnn gnr grb grd gre grg grn grr nbb nbd nbe nbg nbn nbr ndb ndd nde ndg ndn ndr ne- neb ned nee neg nen ner ngb ngd nge ngg ngn nnb nne nng nnn nrb nrd nre nrg nrn nrr rbb rbd rbe rbg rbn rbr rdb rdd rde rdg rdn rdr re- reb red ree reg ren rer rgb rgd rge rgg rgn rgr rnb rnd rng rnn rnr rrb rrd rrg rrn rrr