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, if x_6 were a mechanic, then x_6 is a sailor. There is at least one x_6 for which if x_6 were a lawyer, then x_6 is a mechanic. For all x_6, if x_6 makes tea, then x_6 is a lawyer. For all x_6, x_6 will make tea.
For all x_6, x_6 is a lawyer can be inferred via the universal modus ponens rule. There is at least one x_6 for which if x_6 were a lawyer, then x_6 is a sailor can be inferred via the existential transitivity rule. There is at least one x_6 for which if x_6 makes tea, then x_6 is a mechanic can be inferred via the existential transitivity rule.