[]        [][][][]       [][]          []        [][][][]       [][]     [][][][][][]      []      
   [][]      []        []     [][]        [][]      []        []     [][]     []              [][]      
 []  []      []               [][]      []  []                []     [][]     []            []  []      
     []      [][][][][]                     []       [][][][][]               [][][][][]        []      
     []      []        []     [][]          []      []               [][]               []      []      
     []      []        []     [][]          []      []               [][]     []        []      []      
 [][][][][]    [][][][]       [][]      [][][][][]  [][][][][][]     [][]       [][][][]    [][][][][]