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, x_11 will go running if and only if x_11 is a server. For all x_11, x_11 will make tea if and only if x_11 is sad. There is at least one x_11 for which if x_11 were a server, then x_11 is sad. For all x_11, x_11 will not make tea.
For all x_11, if x_11 goes running, then x_11 is a server can be inferred via the universal biconditional elimination rule. For all x_11, if x_11 makes tea, then x_11 is sad can be inferred via the universal biconditional elimination rule. For all x_11, if x_11 were a server, then x_11 is running can be inferred via the universal biconditional elimination rule. For all x_11, if x_11 were sad, then x_11 is making tea can be inferred via the universal biconditional elimination rule. For all x_11, x_11 is not sad can be inferred via the universal biconditional elimination rule.