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_17, if x_17 were a lawyer, then x_17 is a poet. There is at least one x_17 for which if x_17 were a poet, then x_17 is not a musician. For all x_17, x_17 will not drink water. For all x_17, if x_17 were a poet, then x_17 is a lawyer. For all x_17, x_17 will drink water or x_17 is a musician.
For all x_17, x_17 is a musician can be inferred via the universal disjunctive syllogism rule. For all x_17, x_17 is a lawyer if and only if x_17 is a poet can be inferred via the universal biconditional introduction rule. For all x_17, x_17 is a poet if and only if x_17 is a lawyer can be inferred via the universal biconditional introduction rule.