สมอง, คิด, หัว, ชาย, หญิง, ภาพเงา, บทคัดย่อ, ความสัมพันธ์, คู่, ขัดกัน, กระบวนการคิด
Public Domain
ภาพถ่ายปลอดค่าลิขสิทธิ์ที่เกี่ยวข้อง
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