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A [[quaternary]] is a [[structure]] which comprises four elements.

<blockquote>A quadripartite structure has, since the introduction of the unconscious, always been required in the con- struction of a subjective ordering.<ref>{{Ec}} p. 774</ref></blockquote>

Thus, in a 1953 paper which deals with the neurotic's 'individual myth' (another reference to Levi-Strauss), Lacan remarks that "there is within the neurotic a quartet situation,"<ref>{{L}} 1953b: 231</ref> and adds that this quartet can demonstrate the particularities of each case of neurosis more rigorously than the traditional triangular thematisation of the Oedipus complex.<ref>{{L}} 1953b:232</ref>