Jonas is given a list of rules. What is the last rule on the list?

Jonas is startled by the last rule: rule 8. This rule allowed him to lie: something strictly forbidden in the community.

His mind reeled. Now, empowered to ask questions of utmost rudeness—and promised answers—he could, conceivably (though it was almost unimaginable), ask someone, some adult, his father perhaps: "Do you lie?"