Consider the following premises. John is a writer if and only if Jennifer is excited. Barbara is writing a letter or John is a writer. For all x_13, if x_13 were an astronaut, then x_13 is excited. Barbara is not writing a letter or Jennifer is an astronaut. Can we infer the following from them? If we can, name the inference rule being used: Susan is running.
We cannot infer that from the premises. Therefore the answer is no.