บทคัดย่อ, เส้น, สีเขียว, ตามแนวนอน, ธาตุนีอ็อน, แบบแผน, ออกแบบ, ธง, พื้นหลัง
Public Domain
ภาพถ่ายปลอดค่าลิขสิทธิ์ที่เกี่ยวข้อง
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