What can be inferred from the following premises in a single inference step (ignoring inferences that add new predicates or constants)? Richard is a server. If Richard were a server, then it is snowing. For all x_17, if x_17 were a mechanic, then x_17 is a poet. For all x_17, if x_17 were a poet, then x_17 is a mechanic. If Susan were a mechanic, then it is not snowing.
It is snowing. For all x_17, x_17 is a mechanic if and only if x_17 is a poet. For all x_17, x_17 is a poet if and only if x_17 is a mechanic.