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