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Explicit expressions for primitive idempotent in the ring 
are obtained, where p and q are distinct odd primes with multiplicative order of 2 modulo p and modulo q being 
and ϕ(q) respectively. Hence the idempotent generators of cyclic self dual codes of length pq over Z4 are obtained. Further, it is observed that when p = 8k - 1 and q = 8m - 3, the extension of each of these self dual codes augmented with all-ones vector is a Type I code.
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