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 poet, then x_6 is working. There is at least one x_6 for which if x_6 works, then x_6 is a poet. For all x_6, x_6 is not a server. For all x_6, x_6 will work if and only if x_6 is a server.
There is at least one x_6 for which x_6 will work if and only if x_6 is a poet can be inferred via the existential biconditional introduction rule. There is at least one x_6 for which x_6 is a poet if and only if x_6 will work can be inferred via the existential biconditional introduction rule. For all x_6, if x_6 works, then x_6 is a server can be inferred via the universal biconditional elimination rule. For all x_6, if x_6 were a server, then x_6 is working can be inferred via the universal biconditional elimination rule. For all x_6, x_6 will not work can be inferred via the universal biconditional elimination rule.