x
x
x
x
x
x 
x
x
x
x
x
x
x
x
x x x
x
x x
x
x
x
x
x
x
x
x
x
x
x x
x
x
x
x
x
x
x
x
x
x
x
x x 


x
x
x
x
x
x 
x
x
x
x
x
x
x
x
x x x
x
x x
x
x
x
x
x
x
x
x
x
x
x x
x
x
x
x
x
x
x
x
x
x
x
x x 