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 an astronaut if and only if it is sunny. Linda is an astronaut if and only if it is snowing.
If Linda were an astronaut, then it is sunny can be inferred via the biconditional elimination rule. If Linda were an astronaut, then it is snowing can be inferred via the biconditional elimination rule. If it is sunny, then Linda is an astronaut can be inferred via the biconditional elimination rule. If it snows, then Linda is an astronaut can be inferred via the biconditional elimination rule.