|   |   |   |   |   X---+---@   
|   |   |   |   |   @---Ry  |   
|   |   |   |   |   X---+---@   
|   |   |   |   @---+---Ry  |   
|   |   |   X---+---+---+---O   
|   |   |   X---+---+---+---@   
|   |   |   @---+---+---Ry  |   
|   |   |   X---+---+---+---O   
|   |   |   X---+---+---+---@   
|   |   @---+---+---+---Ry  |   
|   X---+---+---+---+---+---O   
|   @---+---+---+---+---Ry  |   
|   X---+---+---+---+---+---O   
@---+---+---+---+---+---Ry  |   
