Queues: Created by Pass 1 
 
 0   |  1    |    2  |  3    |  4   |   5    |  6   |   7  |   8    |  9  
     |       |       |       |      |        |      |      |        |         
 20  |       |       |       |      |        |      |      |  18    |            
 10  |       |   2   |       |      |        |  6   |      |  28    |     
 30  |       |  12   |       |  4   |        | 16   |      |   8    |      

CHAIN AFTER PASS ONE: 
 
 
 30 → 10  → 20 → 12  → 2 → 4  → 16  → 6  → 8 → 28   → 18 

Queues: Created by Pass 2 
 
 0   |   1    |   2    |   3    |   4   |    5    |   6   |    7  |    8    |   9  
     |        |        |        |       |         |       |       |         |  
 8   |  18    |        |        |       |         |       |       |         |          
 6   |  16    |        |        |       |         |       |       |         |             
 4   |  12    |  28    |        |       |         |       |       |         |      
 2   |  10    |  20    |  30    |       |         |       |       |         |       
 

CHAIN AFTER PASS TWO: 
 
 2  → 4  → 6  → 8  → 10 → 12 → 16 → 18 → 20 → 28 → 30