บทคัดย่อ, ยุ่ง, พื้นหลัง, ทางเรขาคณิต, สีน้ำเงิน, สีฟ้า, ความระส่ำระสาย, วุ่นวาย, ถ่วง, มีฝนฟ้าคะนองกระจาย, ออกแบบ
Public Domain
ภาพถ่ายปลอดค่าลิขสิทธิ์ที่เกี่ยวข้อง
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