.
                                                                       ...
                                                                        ...
                                                                         ...
                                        vvv                                ..
                                    vvvvvvv::
                                   vvvvv::::::
                                   vvvvv:...::
                                   vvv::......:
                                   vv::.......::
                                    v::.......::
                                   vv::.......::
                                    ::::::....vv
                                       :::...:v:
                                        :::::vvv
                                          ::vv