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, x_7 is a poet if and only if x_7 is a server. For all x_7, if x_7 were an electrician, then x_7 is a poet. For all x_7, x_7 is an artist if and only if x_7 is a server. For all x_7, x_7 is not an artist.
For all x_7, if x_7 were a poet, then x_7 is a server can be inferred via the universal biconditional elimination rule. For all x_7, if x_7 were an artist, then x_7 is a server can be inferred via the universal biconditional elimination rule. For all x_7, if x_7 were a server, then x_7 is a poet can be inferred via the universal biconditional elimination rule. For all x_7, if x_7 were a server, then x_7 is an artist can be inferred via the universal biconditional elimination rule. For all x_7, x_7 is not a server can be inferred via the universal biconditional elimination rule.