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murder she purred (1998) — “You have Dave Matthews' concentration face.” Set...
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29,781 Concentration Face Stock Photos, High-Res Pictures, and Images - Getty Images
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Sometimes when I am thinking or concentrating I have a mean look on my face. I'd like to have a neutral or pleasant look, not the mean face. How can I correct
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PDF) Determine the Level of Concentration of Students in Real Time from their Facial Expressions