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The difficulties of defining chiral gauge theories non-perturbatively suggesta vector-like extension of the standard model with three mirror fermionfamilies. Some phenomenological implications of such an extension arediscussed.Comment: latex, 6 pages, 1 figure with epsfig. Talk given at the workshop  "Beyond the Standard Model V", Balholm, Norway, May 199

A non-chiral extension of the standard model with mirror fermions