vec2f(0.5, -0.5)
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[7] B. E. Bayer: “An optimum method for two-level rendition of continuous-tone pictures” (1973). ↑
From that list of 40 or 50 people, it was easy to find and trawl their social media. And that is when they found a photo of Lucy on Facebook with an adult who looked as though she was close to the girl - possibly a relative.