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