What can be inferred from the following premises in a single inference step (ignoring inferences that add new predicates or constants)? For all x_10, if x_10 takes a plane, then x_10 is reading a book. For all x_10, if x_10 were sad, then x_10 is poor. For all x_10, if x_10 were sad, then x_10 is taking a plane. For all x_10, if x_10 reads a book, then x_10 is sad. For all x_10, if x_10 were a carpenter, then x_10 is poor. There is at least one x_10 for which x_10 is a carpenter or x_10 will read a book.
For all x_10, if x_10 takes a plane, then x_10 is sad. For all x_10, if x_10 were sad, then x_10 is reading a book. For all x_10, if x_10 reads a book, then x_10 is poor. For all x_10, if x_10 reads a book, then x_10 is taking a plane.