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write_array (
        f,
        set,
        item_sep=' ',
        nest_prefix='',
        nest_suffix='\n',
        nest_sep='',
        )
Write an array of arbitrary dimension to a file.    A general recursive array writer.  The last four parameters allow
    a great deal of freedom in choosing the output format of the
    array.  The defaults for those parameters give output that is
    gnuplot-readable.  But using (",", "{", "}", ",
")would output
    an array in a format that Mathematica could read.item_sepshould not contain%(or if it does, it should be escaped to%%) since it is put into a format string.     The default 2-d file organization:
 
        set[0,0] set[0,1] ...
        set[1,0] set[1,1] ...
    The 3-d format:
 
        set[0,0,0] set[0,0,1] ...
        set[0,1,0] set[0,1,1] ...
        set[1,0,0] set[1,0,1] ...
        set[1,1,0] set[1,1,1] ...
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