Start frame: approved frame 17. Duration: 3.5s, 16:9. Keep both sisters' adult faces, proportions, outfits, the evening street location and the Pixar 3D CG render style perfectly locked to the starting frame throughout — no morphing, no drift. MOTION: at natural real-world speed — the elder sister laughs, head tilting back slightly, mouth open in a genuine silent laugh shape (not forming words)...
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