Compare the digits from left to right.<br><br>All numbers have 5 digits. Compare the ten-thousands: all are 8.<br>Compare the thousands: 1, 1, 6, 6.<br>&bull; The numbers with thousands digit 1 are smaller. Among 81659 and 81596: thousands both 1, hundreds: 5 &lt; 6, so 81596 is smallest, then 81659.<br>&bull; Among 86159 and 86195: thousands both 6, hundreds both 1, tens: 5 &lt; 9, so 86159 comes next, then 86195.<br><br>Final Answer: 81596, 81659, 86159, 86195