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: It is cold or it is late. If it is cold, then Linda is an office clerk. Barbara is not working. Barbara is working if and only if Linda is an office clerk.
If Barbara works, then Linda is an office clerk can be inferred via the biconditional elimination rule. If Linda were an office clerk, then Barbara is working can be inferred via the biconditional elimination rule. Linda is not an office clerk can be inferred via the biconditional elimination rule.