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: Linda is playing squash if and only if it is late. If it is windy, then John is bored. John is not bored. It is windy or it is not late.
It is not windy can be inferred via the modus tollens rule. If it is late, then it is windy can be inferred via the rewriting rule. If Linda plays squash, then it is late can be inferred via the biconditional elimination rule. If it is late, then Linda is playing squash can be inferred via the biconditional elimination rule.