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