* Title:When needed
* Designer:jf
* Type:Solution
* Follows:syvopos
* Physics:2
                              hhhhhhhhhhhhhhhh    
                              ::::::::::::::::    
                                                  
                                                  
                                                  
                                                  
                                                  
                                                  
                                                  
                                                  
                                                  
$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$
(1$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$
==$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$QTQ
  xxxxxxxxxxxxxxxxxxxxxxxxxxxM                 Q1Q
(h                                             QQQ
==============================                    
                                                  
                                                  
                                                  
                                                  
                                                  
                                                  
                                                  
                                                  
                                                  
                                                  
                                                  
                                                  
                                                  
(h