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: If it is sunny, then Patricia is cooking. It is not overcast or it is cold. Patricia is cooking if and only if it is cold. It is overcast or it is sunny. Barbara is listening to a song.
It is sunny or it is cold can be inferred via the resolution rule. If Patricia cooks, then it is cold can be inferred via the biconditional elimination rule. If it is cold, then Patricia is cooking can be inferred via the biconditional elimination rule.