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   ["Keyboard shortcuts", "keyboard.htm", "11"],
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    ["View menu", "view_menu.htm", "11"],
    ["Insert menu", "insert_menu.htm", "11"],
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    ["Window menu", "window_menu.htm", "11"],
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  ],
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   ["Managing worksheets", null, "1",
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    ["Insert cells", "insert_cells.htm", "11"],
    ["Delete cells", "delete_cells.htm", "11"],
    ["Hide cells", "hide_cells.htm", "11"],
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    ["Enter values and formulas", "values.htm", "11"],
    ["Cut, copy, paste, or delete the cell contents", "cut_copy_paste.htm", "11"],
    ["Undo the last action", "undo.htm", "11"],
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   ["General settings", "general_settings.htm", "11"],
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   ["Spelling settings", "spelling_settings.htm", "11"],
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 ["License and registration", null, "1",
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function arr_flatten (x) {
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