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HIP, a set of computer packages for symbolic calculation of Feynman diagrams, is presented. The packages were designed as an aid in calculating tree-level multiparticle electroweak production processes, though they can be used for a much wider class of calculations. The packages have been used to calculate such processes as e gamma->W nu and gamma gamma ->W+W- at tree level with arbitrary W gamma couplings. The packages are written in the computer algebra language Mathematica, which provides a powerful working environment.
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