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 poor if and only if it is windy. It is not windy. For all x, if x were an office clerk, then x is poor.
If Susan were poor, then it is windy can be inferred via the biconditional elimination rule. If it is windy, then Susan is poor can be inferred via the biconditional elimination rule. Susan is not poor can be inferred via the biconditional elimination rule.