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_14, x_14 will write a letter and x_14 will work. For all x_14, x_14 will take a plane. There is at least one x_14 for which x_14 will make tea.
For all x_14, x_14 will write a letter can be inferred via the universal simplification rule. For all x_14, x_14 will work can be inferred via the universal simplification rule. There is at least one x_14 for which x_14 will make tea and x_14 will take a plane can be inferred via the existential conjunction rule. There is at least one x_14 for which x_14 will take a plane and x_14 will make tea can be inferred via the existential conjunction rule.