Tiers: 4
Stacks: 9
Containers: 21
Stack 0: 0    14   17   16   
Stack 1: 5    1    15   
Stack 2: 12   
Stack 3: 11   13   10   4    
Stack 4: 6    9    20   
Stack 5: 
Stack 6: 2    18   
Stack 7: 8    3    
Stack 8: 19   7