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       but entire arrays or array slices are denoted by '@',
       which works much like the word "these" or "those":
...
       and entire hashes are denoted by '%':

           %days               # (key1, val1, key2, val2 ...)

    # An array is written like @days and can be thought
...
    # You write a hash like %days, and you can think of
    #    it as a list of key/value pairs.
    %days               # (key1, val1, key2, val2 ...)