Tiers: 4
Stacks: 7
Containers: 22
Stack 0: 3    
Stack 1: 8    4    18   
Stack 2: 12   13   1    
Stack 3: 15   2    5    11   
Stack 4: 0    19   20   
Stack 5: 6    14   7    10   
Stack 6: 9    21   16   17