( -4 , 7 )
( -8 , 4 )
( -7 , -2 )
( -5 , -9 )
( 0 , -7 )
( 5 , -6 )
( 6 , -4 )
( 0 , 1 )
( 4 , 4 )
( 8 , 8 )
