bbbee be-er be-ro beber beebe beez berbe berob beroe beror berre berze berzo bezer bo-bo bobr bobre boero booer boore booze borbo boree borer boro- boroo borre borro bozoo breer breo- brere breze brobo broer broze brrrr ebber eeeee eorre erbbe erber erere eroor erore error ezbob o-r-b oboro obreb obrez obzor oo-er ooooo oreo- orere orero orobe orobo oroer ozero ozoro rebbe reber reere reeze rere- reree rerez rerob rezzo ro-ro robbe robbo rober robo- robor roero rooer roore rorer zboze zebre zeebo zeero zerbe zerbo zeror zerre zober zorbo zorro zzzzz