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Lattice connection: a primary school math problem that stumbles college students!
1 Lou is right. If you are not allowed to walk outside, there is no solution.

(Proved by assignment method:

1 2 1 _ 1

2 1 2 1 2

1 2 1 2 1

2 1 2 1 2

1 2 1 2 1

Each connection always alternates between 1 and 2, but * * has 13 1 and 1 1 2, which cannot be completed.

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