บทคัดย่อ, คอมพิวเตอร์กราฟฟิค, เศษส่วน, กราฟิก, คอมพิวเตอร์, สี, ความสับสนวุ่นวาย
Public Domain
ภาพถ่ายปลอดค่าลิขสิทธิ์ที่เกี่ยวข้อง
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