Consider the following premises. For all y_4, if y_4 were an artist, then y_4 is fast. If it snows, then Robert is an artist. For all y_4, if y_4 were fast, then y_4 is an artist. Can we infer the following from them? If we can, name the inference rule being used: Robert is fast.
We cannot infer that from the premises. Therefore the answer is no.