What can be inferred from the following premises in a single inference step (ignoring inferences that add new predicates or constants)? Karen is an office clerk if and only if Karen is reading a book. Karen is not reading a book. Karen is not an office clerk if and only if Patricia is a scientist.
If Karen were an office clerk, then Karen is reading a book. If Karen were not an office clerk, then Patricia is a scientist. If Karen reads a book, then Karen is an office clerk. If Patricia were a scientist, then Karen is not an office clerk. Karen is not an office clerk.