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: Susan is fast if and only if it is overcast. It is sunny if and only if Susan is fast. It is sunny or it is not overcast.
If it is overcast, then it is sunny can be inferred via the rewriting rule. If Susan were fast, then it is overcast can be inferred via the biconditional elimination rule. If it is sunny, then Susan is fast can be inferred via the biconditional elimination rule. If it is overcast, then Susan is fast can be inferred via the biconditional elimination rule. If Susan were fast, then it is sunny can be inferred via the biconditional elimination rule.