1 1
 0 0
 0 0
 1 1
 1 0
 0 0
 1 1
 0 0
 1 0
 1 0
 1 1
 0 0
 1 1
 1 0
 0 0
 0 0
 0 0
 0 0
 1 0
 0 0
 0 0
-1