ลูกบอล, สี, คลื่นความถี่, บทคัดย่อ, แบบแผน, ออกแบบ, ตกแต่ง, คณิตศาสตร์
Public Domain
ภาพถ่ายปลอดค่าลิขสิทธิ์ที่เกี่ยวข้อง
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