What can be inferred from the following premises in a single inference step (ignoring inferences that add new predicates or constants)? For all x_15, x_15 is a carpenter if and only if x_15 is a poet. For all x_15, x_15 is a poet if and only if x_15 is a server. For all x_15, x_15 will sleep if and only if x_15 is a carpenter.
For all x_15, if x_15 were a carpenter, then x_15 is a poet. For all x_15, if x_15 were a poet, then x_15 is a server. For all x_15, if x_15 sleeps, then x_15 is a carpenter. For all x_15, if x_15 were a poet, then x_15 is a carpenter. For all x_15, if x_15 were a server, then x_15 is a poet. For all x_15, if x_15 were a carpenter, then x_15 is sleeping.