Consider the following premises. For all x_10, if x_10 were happy, then x_10 is writing a letter. For all x_10, if x_10 writes a letter, then x_10 is happy. For all x_11, x_11 will write a letter. Can we infer the following from them? If we can, name the inference rule being used: Karen is not a mechanic.
We cannot infer that from the premises. Therefore the answer is no.