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: Robert is a taxi driver if and only if Karen is a cashier. It is cloudy if and only if John is a poet. John is not a poet. Robert is a taxi driver if and only if it is cloudy.
If Robert were a taxi driver, then Karen is a cashier can be inferred via the biconditional elimination rule. If it is cloudy, then John is a poet can be inferred via the biconditional elimination rule. If Robert were a taxi driver, then it is cloudy can be inferred via the biconditional elimination rule. If Karen were a cashier, then Robert is a taxi driver can be inferred via the biconditional elimination rule. If John were a poet, then it is cloudy can be inferred via the biconditional elimination rule. If it is cloudy, then Robert is a taxi driver can be inferred via the biconditional elimination rule. It is not cloudy can be inferred via the biconditional elimination rule.