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: Jessica is not a mechanic or Linda is taking a plane. Susan is rich if and only if Linda is a musician. Susan is not rich. Linda is a musician or Richard is working.
If Susan were rich, then Linda is a musician can be inferred via the biconditional elimination rule. If Linda were a musician, then Susan is rich can be inferred via the biconditional elimination rule. Linda is not a musician can be inferred via the biconditional elimination rule.