-     #include <list> 
-   
-     struct Grass { 
-         struct { 
-             int x, y; 
-         } position; 
-     }; 
-   
-     int main() { 
-         std::list<Grass> grassList; 
-         for(int i=0;i<50;i++){ 
-             for(int j=0;j<50;j++){ 
-                 Grass g1; 
-                 g1.position.x = i; 
-                 g1.position.y = j; 
-                 grassList.push_back(g1); 
-             } 
-         }   
-     } 
-   
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