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The math problem in grade two is about mine clearance.
Hello, cold cherry warms up to answer for you:

2

The one on the left,

The first line, 1 * 1

The second line, 2 2 1

The third line, * 1 0

second

The first line, 1 2 2

The second line, 2 * *

The third line, * 3 2

third

The first line, 2 * 2

The second line, 3 * 3

The third line, 2 * 2

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