ตัวอักษร, ธง, ส่วนหัว, abc, อ่าน, เรียน, การรู้หนังสือ, การศึกษา, การอบรม, การสื่อสาร, เขียน
Public Domain
ภาพถ่ายปลอดค่าลิขสิทธิ์ที่เกี่ยวข้อง
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