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The basic code proposed in the referenced parep is identical with a three-zero substitution code proposed previously, and the remaining codes are variants obtained by adding one or more zeros in front of three-zero substitution kernels. The bipolar with six-zero substitution (B6ZS) code is superior in baseline wander performance to codes based on the three-zero substitution kernels, and other differences in performance are small.
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V. Johannes (1972) studied this question.
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