สีเขียว, พื้นหลัง, เกลียว, แบบแผน, หมุน, บทคัดย่อ, ออกแบบ, เศษส่วน, ศิลปะ, คอมพิวเตอร์, สร้าง
Public Domain
ภาพถ่ายปลอดค่าลิขสิทธิ์ที่เกี่ยวข้อง
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