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: Patricia is sleeping if and only if it is cold. It is cold or Patricia is not sleeping.
If Patricia sleeps, then it is cold can be inferred via the rewriting rule. If Patricia sleeps, then it is cold can be inferred via the biconditional elimination rule. If it is cold, then Patricia is sleeping can be inferred via the biconditional elimination rule.