Selforganization in a system of binary strings with topological interactions

We consider an artiicial reaction system whose components are binary strings. Upon encounter, two binary strings produce a third string which competes for storage space with the originators. String types or species can only survive when produced in suucient numbers. Spatial interactions through introduction of a topology and rules for distance-dependent reactions are discussed. We observe three diierent kinds of survival strategies of binary strings: cooperation of strings, exploitation of niches and parasitic behavior.