@author aniwey
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               |                   _______     |    |    |    |   |  |    | |   |   |    |            |_____     _____________________________               |                       ~                        ~
    ~          |                  /       \    |    |    |    |   |  |    |~|   |   |    |        ~         |   /         ~          ~        \              |                                    ~
               |                  |       |    | ~  |    | ~  |   |  |    | |   | ~ |    |                  |   \_____________________________/              |
               |                  |     ~ |    |    |    |    |   \__/    \_/   \___/    |               ~  |                                                |                        _________________________
            ~  |                  | ~     |    |    |    |    \_____________________     | ~                |                                                |    ~                  /                         |
               |                  |       |    |    |    |                          |    |                  |_____     _______________________               |               ~      /                          |
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               |                  |       |    |    |    |           ~              |    |       ~                |   \_______________________/              \____________________/                            |
               |                  |    ~  |    |  ~ |    |                       ~  |    |                        |                                                                      _                     |
               |                  |       |    |    |    |     ~                    |    |                  ~     |                                                                     | |                    |
          ~    |                  |       |    |    |    |                          |    |                        |_____________________________________________              _____     | |___________________/
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   ~           |__________________|_______|____|    |____|__________________________|____|______________________________________________________________________|____________|_____|____|_______________________