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: Charles is a lawyer or it is not cold. Charles is a lawyer if and only if it is cold.
If it is cold, then Charles is a lawyer can be inferred via the rewriting rule. If Charles were a lawyer, then it is cold can be inferred via the biconditional elimination rule. If it is cold, then Charles is a lawyer can be inferred via the biconditional elimination rule.