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, if x_7 writes a letter, then x_7 is an artist. There is at least one x_7 for which x_7 is not a lawyer or x_7 will make tea. For all x_7, x_7 is an artist or x_7 will not make tea. For all x_7, x_7 is a lawyer or x_7 will write a letter.
There is at least one x_7 for which x_7 will write a letter or x_7 will make tea can be inferred via the existential resolution rule. For all x_7, if x_7 makes tea, then x_7 is an artist can be inferred via the universal rewriting rule.