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1. A*B
2. B*A
3. A*A

1, 2

2, x

3, 1

x, 1

y, 3

3, 2

1, 3

3, y

1, x

2, 3

x, 2

2 ,y

3, x

x, 3

2, 2

1, 1

y, 1

3, 3

y, 2

2, 1

1, y