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In informational terms, a module dedicated to process information always has specific inputs and outputs. It describes a particular process constrained by specific rules. A processing chain can be a serial combination or a parallel combination of such modules. Thus, an architecture of language engineering, each processing chain becomes a particular instantiation of all possible paths. A processing chain is built from a choice of tasks underlying modules that an engineer wants to apply to the text. Therefore, in this perspective, a fundamental question arises: given a set of modules, what are the eligible chains of all combinations of the given modules? This is what we will discuss about in our paper.