∧                     ∧
\ \                   / /
 \  \  /////\\\\\      /  /
  \   \/////\\\\\\/   /
   \  ηη         ηη  /
   ///ηη ===   === η\\                   
  /// ηη      \   ηη //                          
 ///  ηη       \  ηη \\               
 |||  ηη               ω      ηη //               
 |||   η\     ）  /η //                                 
 \\\   η           η //    
 ///                //          
//                                      
//