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Eco-grammar systems represent grammar systems which were motivated by the behaviour of ecosystems. They were introduced in 1994 in order to describe evolving environment and community of agents together with the interplay among them. Positioned eco-grammar systems (PEG systems, for short) were introduced in our previous paper as a variant of the eco-grammar systems. Motivation for introducing the PEG systems and its main difference from the original eco-grammar systems is that we focus on the embodiment of the age...