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As a ''noun'', the ''noun-form'' designates one of the ''psychical systems'', refers to the [[unconscious|unconscious]] system, described by [[Freud]]'s, which [[Freud]] described in his, first theory of [[psychetopology|mentaltopographical model]] [[structure]] (of the "[[topographical modelpsyche]]"), his first theory of [[topographypsyche|mental]] of the [[psychestructure]].