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