What can be inferred from the following premises in a single inference step (ignoring inferences that add new predicates or constants)? There is at least one x_11 for which if x_11 were happy, then x_11 is reading a book. For all x_11, if x_11 reads a book, then x_11 is happy. For all x_11, x_11 is happy if and only if x_11 will read a book.
There is at least one x_11 for which x_11 is happy if and only if x_11 will read a book. There is at least one x_11 for which x_11 will read a book if and only if x_11 is happy. For all x_11, if x_11 were happy, then x_11 is reading a book. For all x_11, if x_11 reads a book, then x_11 is happy.