-er bbb bbe bbg bbk bbl bbr be- beb bee beg bek bel ber bgb bge bgg bgk bgl bgr bkb bke bkg bkk bkl bkr blb ble blg blk bll blr brb bre brg brk brl brr ebb ebe ebg ebk ebl ebr eeb eee eeg eek eel eer egb ege egg egl egr ekb eke ekg ekl ekr elb ele elg elk ell elr erb ere erg erk erl err gbe gbg gbk gbl gbr ge- geb gee geg gek gel ger ggb ggg ggr gkb glb gle glg glk gll glr grb gre grg grk grl grr kbb kbe kbk kbl kbr ke- keb kee keg kek kel ker kgb kgl kkb kke kkk kkl kkr kl- klb klg klr krg krk krl krr lbb lbe lbg lbk lbl lbr leb lee leg lek lel ler lgb lge lgg lgk lgl lgr lkb lkg lkl lkr llb lle llg llk lll llr lrb lrg lrk lrr rbb rbe rbg rbk rbl rbr re- reb ree reg rek rel rer rgb rge rgg rgk rgr rkb rke rkg rkk rle rlg rll rlr rrb rrg rrk rrl rrr