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: Elisabeth is not a sailor. Elisabeth is a sailor if and only if Robert is cooking. Robert is cooking or it is sunny.
If Elisabeth were a sailor, then Robert is cooking can be inferred via the biconditional elimination rule. If Robert cooks, then Elisabeth is a sailor can be inferred via the biconditional elimination rule. Robert is not cooking can be inferred via the biconditional elimination rule.