What can be inferred from the following premises in a single inference step (ignoring inferences that add new predicates or constants)? For all x_6, x_6 will cook or x_6 will take a plane. For all x_6, if x_6 cooks, then x_6 is running. For all x_6, x_6 will go running or x_6 will not take a plane. For all x_6, if x_6 were sad, then x_6 is not running.
For all x_6, if x_6 takes a plane, then x_6 is running.