Consider the following premises. For all x_11, x_11 will drink water if and only if x_11 is a mechanic. For all x_11, x_11 will drink water if and only if x_11 is a mechanic. Can we infer the following from them? If we can, name the inference rule being used: The fact that Patricia drinks water does not imply that Patricia is a mechanic.
That contradicts the premises. Therefore the answer is no.