7

1

1

1

1

1

1

1

1

1

1

1

1

1

1

1

1

1

1

1

1

1

1

1

1

4

4

1

1

4

4

4

4

1

1

1

�

�

�

�

�

�

�

�

�

�

�

�

�

�