What can be inferred from the following premises in a single inference step (ignoring inferences that add new predicates or constants)? Name the inference rule being used: For all x_13, if x_13 goes running, then x_13 is reading a book. For all x_13, if x_13 reads a book, then x_13 is running. Barbara is running or Thomas is not a writer.
If Thomas were a writer, then Barbara is running can be inferred via the rewriting rule. For all x_13, x_13 will go running if and only if x_13 will read a book can be inferred via the universal biconditional introduction rule. For all x_13, x_13 will read a book if and only if x_13 will go running can be inferred via the universal biconditional introduction rule.