1

1

1

1

1

1

1

1

�

�

�

�

�

�

�

�

2

�

�

�

�

�

�

�

�

�

�

�

�

�

�

�

�

�

�

�

�

�

�

�

�

�

�

�

�

�

�

�

�

�