N

L

M

1

0

0

0

2

0

0

0

2

0

0

2

0

2

0

0

4

0

2

0

−1

0

2

0

−1

2

2

0

−1

4

0

2

1

0

0

2

1

0

2

2

1

0

4

0

2

0

1

0

2

0

1

2

2

0

1

4

0