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: If it is cold, then Thomas is a soldier. If it is not cold, then Jessica is an office clerk. For all x_16, x_16 is a soldier if and only if x_16 will play tennis. Thomas is not playing tennis.
For all x_16, if x_16 were a soldier, then x_16 is playing tennis can be inferred via the universal biconditional elimination rule. For all x_16, if x_16 plays tennis, then x_16 is a soldier can be inferred via the universal biconditional elimination rule.