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: For all x_16, x_16 will cook if and only if x_16 is a bartender. If Susan were a sailor, then David is curious. For all x_16, if x_16 were a politician, then x_16 is cooking. For all x_16, if x_16 were a bartender, then x_16 is a sailor.
For all x_16, if x_16 cooks, then x_16 is a bartender can be inferred via the universal biconditional elimination rule. For all x_16, if x_16 were a bartender, then x_16 is cooking can be inferred via the universal biconditional elimination rule.