I think I found a typo in the book. (p127)

[KimJiSeong1994]

Thank you for writing such a great book and helping me understand GNN better.

While reading a book, I think I found a typo in the book.
At 127p, I understand Figure 8.2 to be an explanation of embedding through neighbors in Figure 8.1.
In Figure 8.1, the 1-hop of node (1) is represented by [0, 4, 6], while in Figure 8.2, the 1-hop of node (1) is represented by [0, 4, 5, 6].