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_6, x_6 will climb a mountain. For all x_6, x_6 will take a plane. For all x_6, x_6 is an office clerk.
For all x_6, x_6 will climb a mountain and x_6 will take a plane can be inferred via the universal conjunction rule. For all x_6, x_6 will climb a mountain and x_6 is an office clerk can be inferred via the universal conjunction rule. For all x_6, x_6 will take a plane and x_6 will climb a mountain can be inferred via the universal conjunction rule. For all x_6, x_6 will take a plane and x_6 is an office clerk can be inferred via the universal conjunction rule. For all x_6, x_6 is an office clerk and x_6 will climb a mountain can be inferred via the universal conjunction rule. For all x_6, x_6 is an office clerk and x_6 will take a plane can be inferred via the universal conjunction rule.