2 
4 7 4 
0 4 
2 4 
2 2 
-2 2 
4 7 2 
0 4 
2 4 
2 2 
-2 2

Case 1: 
Carl finished the path at time 13 
The ants finished in the following order: 
0 2 1 3 4 5 6 
The last ant finished the path at time 29 

Case 2: 
Carl finished the path at time 13 
The ants finished in the following order: 
0 4 1 5 2 6 3 
The last ant finished the path at time 19