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_11, if x_11 makes tea, then x_11 is a carpenter. For all x_11, x_11 will not play squash or x_11 is a soldier. For all x_11, x_11 is a carpenter if and only if x_11 will read a book. For all x_11, if x_11 were a soldier, then x_11 is reading a book. There is at least one x_11 for which x_11 will play squash or x_11 will make tea.
There is at least one x_11 for which x_11 will make tea or x_11 is a soldier can be inferred via the existential resolution rule. For all x_11, if x_11 were a carpenter, then x_11 is reading a book can be inferred via the universal biconditional elimination rule. For all x_11, if x_11 reads a book, then x_11 is a carpenter can be inferred via the universal biconditional elimination rule.