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 A simple vector class

    Instances of the Vec class  can be constructed from numbers

    >>> a = Vec(1, 2, 3)
    >>> b = Vec(3, 2, 1)

    added
    >>> a + b
    Vec(4, 4, 4)

    subtracted
    >>> a - b
    Vec(-2, 0, 2)

    and multiplied by a scalar on the left
    >>> 3.0 * a
    Vec(3.0, 6.0, 9.0)

    or on the right
    >>> a * 3.0
    Vec(3.0, 6.0, 9.0)
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