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    In a primary rainbow, the arc shows red on the outer part and violet on the inner side. This rainbow is caused by light being refracted when entering a droplet of water, then reflected inside on the back of the droplet and refracted again when leaving it.

    Given a piece of music, it is interesting to count how many times each of the individual twelve musical notes is played, and understand their relative weight, or importance, in the piece. The hystogmam below is the result of such an analysis perfoemed on Untitled_710420_-

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