11. In the bookbinding workshop. A piece fell out of the book, the first page of which is numbered 328, and the number of the last page is written with the same digits but in a different order. How many pages are in the missing piece?
11. Since the last page must have a higher number of a different parity than the initial one, its number is 823. Answer: 496 pages fell out.

${ }^{1}$ Notation: $p-p$ king, $l-l$ liar.

27 In a country of knights and liars