On the Subject of Mahjong Quiz (Hard)

You thought this was simple didn't you?

Now that you understand the basics the finding waits for mahjong hands it's time to step it up. The rules are the same, except that now the given hands will have more complex shapes. Additionally, it is now possible for given hands to have no possible waits to keep you on your toes. Recall that in mahjong there are only 4 copies of each tile. If the given hand already contains 4 copies of the same tile, then that tile can not be a valid wait since you'd be waiting for a 5th non-existent tile. If a hand has no possible waits click "CONFIRM" while no tiles have been selected.