พจนานุกรม, ตัวอักษร, เรียน, อ่าน, abc, การศึกษา, ลูกโป่ง, การรู้หนังสือ, ไม่รู้หนังสือ
Public Domain
ภาพถ่ายปลอดค่าลิขสิทธิ์ที่เกี่ยวข้อง
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