สมอง, หญิง, เครื่องหมายคำถาม, แนวคิด, ความคิด, สัญลักษณ์, สติปัญญา, ตรรกะ, ความฉลาด, ความเข้าใจ, คำถาม
Public Domain
ภาพถ่ายปลอดค่าลิขสิทธิ์ที่เกี่ยวข้อง
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