In the below example given in the text, 6 needs to come after both 2, and 0 because it depends on both. But in Order 1 and Order 3, 6 comes before 0.

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Consider the following Directed Acyclic Graph (DAG):

    5        7
   / \      / \
  2   0    3   4
   \ /    /     \
    6    1       8

In this graph, there are several possible topological sorts:

1. Order 1: 7, 5, 2, 6, 3, 1, 0, 4, 8
2. Order 2: 7, 5, 2, 3, 1, 0, 4, 6, 8
3. Order 3: 5, 7, 3, 2, 1, 6, 0, 4, 8