Structure
arrangement and organization of interrelated elements in an object or system, or the object or system so organized From Wikipedia, the free encyclopedia
In science, structure is a fundamental concept. It means the arrangement of parts. Examples are the organs in a body, or crystals in a substance like granite.[1]

A structure may refer to buildings, machines and similar things made by people as well as to a rock or a mineral, atoms or sentences. It always reflects the hierarchy of its parts.
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