ถาม, คณะกรรมการ, เขียน, ปัญหา, ขอร้อง, ตัวอักษร, การเขียน, ผนัง, หิน, อิฐ, กระดานดำ
Public Domain
ภาพถ่ายปลอดค่าลิขสิทธิ์ที่เกี่ยวข้อง
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