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_7, x_7 will not make tea. There is at least one x_7 for which x_7 will work. For all x_7, x_7 will go running or x_7 is a doctor. For all x_7, x_7 will make tea if and only if x_7 will go running.
For all x_7, if x_7 makes tea, then x_7 is running can be inferred via the universal biconditional elimination rule. For all x_7, if x_7 goes running, then x_7 is making tea can be inferred via the universal biconditional elimination rule. For all x_7, x_7 will not go running can be inferred via the universal biconditional elimination rule.