-er bbb bbe bbg bbn bbr be- beb bee beg ben ber bgb bge bgg bgn bgr bnb bne bng bnn bnr brb bre brg brn brr ebb ebe ebg ebn ebr eeb eee eeg een eer egb ege egg egn egr en- enb ene eng enn enr erb ere erg ern err gbe gbg gbn gbr ge- geb gee geg gen ger ggb ggg ggn ggr gnb gne gnn gnr grb gre grg grn grr nbb nbe nbg nbn nbr ne- neb nee neg nen ner ngb nge ngg ngn nnb nne nng nnn nrb nre nrg nrn nrr rbb rbe rbg rbn rbr re- reb ree reg ren rer rgb rge rgg rgn rgr rnb rng rnn rnr rrb rrg rrn rrr