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 it is cloudy, then Robert is making tea. Robert is a mechanic if and only if it is cloudy. If Robert makes tea, then Robert is a mechanic.
If it is cloudy, then Robert is a mechanic can be inferred via the transitivity rule. If Robert were a mechanic, then it is cloudy can be inferred via the biconditional elimination rule. If it is cloudy, then Robert is a mechanic can be inferred via the biconditional elimination rule.