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 were a taxi driver, then x_13 is cooking. For all x_13, if x_13 cooks, then x_13 is reading a book. If Michael reads a book, then Michael is a taxi driver. It is sunny if and only if Michael is a taxi driver. It is not sunny.
If it is sunny, then Michael is a taxi driver can be inferred via the biconditional elimination rule. If Michael were a taxi driver, then it is sunny can be inferred via the biconditional elimination rule. Michael is not a taxi driver can be inferred via the biconditional elimination rule. For all x_13, if x_13 were a taxi driver, then x_13 is reading a book can be inferred via the universal transitivity rule.