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: If David were fast, then Michael is reading a book. If David were happy, then it is late. If Michael reads a book, then David is happy.
If David were fast, then David is happy can be inferred via the transitivity rule. If Michael reads a book, then it is late can be inferred via the transitivity rule.