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: There is at least one x_7 for which x_7 will not go running or x_7 will read a book. For all x_7, x_7 will take a plane if and only if x_7 will play squash. For all x_7, if x_7 reads a book, then x_7 is playing squash. For all x_7, x_7 will go running or x_7 will take a plane.
There is at least one x_7 for which x_7 will take a plane or x_7 will read a book can be inferred via the existential resolution rule. For all x_7, if x_7 takes a plane, then x_7 is playing squash can be inferred via the universal biconditional elimination rule. For all x_7, if x_7 plays squash, then x_7 is taking a plane can be inferred via the universal biconditional elimination rule.