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Solve the following problem using Python, implementing the functions described below, one line at a time
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Description:

def _square_segment(radius, origin):
    '''Vertices for a square
    '''
    return np.array(((origin[0] - radius, origin[1] - radius),
                     (origin[0] - radius, origin[1] + radius),
                     (origin[0] + radius, origin[1] + radius),
                     (origin[0] + radius, origin[1] - radius)))