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The first author thanks the Belgian Nationaal Fonds voor Wetenschappelijk Onderzoek for its support. The authors would like to thank Princeton University and The Institute for Advanced Study, respectively, for their hospitality during part of the preparation of this paper
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Denef, J., Lipshitz, L. Ultraproducts and approximation in local rings. II. Math. Ann. 253, 1–28 (1980). https://doi.org/10.1007/BF01457817
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DOI: https://doi.org/10.1007/BF01457817