class documentation
        
        
        A class to represent a node in a doubly linked list.
| Method | __init__ | Initialize a node with the given x-coordinate and info. | 
| Method | copy | copy the node | 
| Instance Variable | closest | Undocumented | 
| Instance Variable | cnext | Undocumented | 
| Instance Variable | info | Undocumented | 
| Instance Variable | ndomr | Undocumented | 
| Instance Variable | next | Undocumented | 
| Instance Variable | prev | Undocumented | 
| Instance Variable | x | Undocumented |