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