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Given a curve over a field , the period of is the gcd of degrees of -rational divisor classes, while the index is the gcd of degrees of -rational divisors. S. Lichtenbaum showed that the period and index must satisfy certain divisibility conditions. For given admissible period, index, and genus, we show that there exists a curve and a number field with these desired invariants, as long as the index is not divisible by .

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