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Let R be a commutative ring with identity. For a finitely generated projective R-module P and for a prime ideal p of R, we define rkp P = rankRpPp. Then we get a function rk P : SpecR → Z. In this paper we construct a commutative ring R with identity and a nitely generated projective R-module P such that the function rk P : SpecR → Z is injective.