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Solve the following problem using Python, implementing the functions described below, one line at a time
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Description:
 def construct_fixture_middleware(fixtures):
 """ Constructs a middleware which returns a static response for any method which is found in the provided fixtures. """

    def fixture_middleware(make_request, web3):
        def middleware(method, params):
            if method in fixtures:
                result = fixtures[method]
                return {'result': result}
            else:
                return make_request(method, params)
        return middleware
    return fixture_middleware