Even plates are stacked into one plate, and then placed at will, as long as the number of eggs in each plate is odd.

For example:

Stack 6 disks, including 9 disks, and stack the remaining 3 disks with 9 disks (or 5, 1 11,7, 13, 7, 3, 13,/kloc-. If six disks are stacked in 1 1, the number of remaining disks can be 5, 1 1, 9, 7, 13, 5, 15, 3, 7, and so on.