On a generalization of the pless symmetry codes*

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A class of matrices which are orthogonal over the reals and contain only the elements, 0, ± 1, is constructed. For certain parameters, these matrices are used to construct a class of self dual codes over GF(3). This class is shown to contain the class of symmetry codes and possesses many of their properties.

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This work supported by the National Research Council of Canada, Grant No. A-7382.