Generate an abstract image featuring multiple black wavy lines of varying thickness and opacity against a white background. The lines should create a sense of movement and flow, resembling waves or flowing water. The style should be vector-based, with a slightly textured or hand-drawn feel to the lines, not perfectly smooth. The composition should be horizontally oriented, with the waves occupying the majority of the space. The color palette is strictly black and white, with variations in grayscale within the black lines to add depth.
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