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We give a prescription for calculating all quark diagrams associated with any given particle diagram. The amplitude of a multi-Regge quark diagram is shown to be equal to that term of the full amplitude which has discontinuities in the planar variables. Although this result holds only when exchange degeneracy is assumed, our prescription can also be used in the absence of exchange degeneracy. Some peculiarities related to the charge-conjugation structure of quark diagrams are discussed.

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