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The upper [[chain]] (from ''[[jouissance]]'' to [[castration]]) is the [[signifying chain]] in the [[unconscious]], the level of the [[enunciation]].
The [[structure]] is thus duplicated: the upper part of the [[graph]] is [[structured ]] exactly like the lower part.
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[[Lacan ]] introduces two new siglas here: S(<strike>O</strike>) and ($<>D).
These two siglas from the upper part of the graph hold a [[position ]] structurally homologous to the position of the symols O and s(O) from the lower part.
