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 Susan reads a book, then it is cold. If Robert were an astronaut, then it is cold. It is raining or Joseph is a scientist. If Joseph were a scientist, then Susan is reading a book. If it rains, then Robert is an astronaut.
If Joseph were a scientist, then it is cold can be inferred via the transitivity rule. If it rains, then it is cold can be inferred via the transitivity rule.