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