What can be inferred from the following premises in a single inference step (ignoring inferences that add new predicates or constants)? For all x_5, if x_5 were a mechanic, then x_5 is happy. For all x_5, x_5 is a mechanic or x_5 is not happy. Karen is not happy.
For all x_5, if x_5 were happy, then x_5 is a mechanic.