ไม่, เชิงลบ, คณะกรรมการ, ชอล์ก, ตัวอักษร, โรงเรียน, ลายมือ, การยกเลิก, การปฏิเสธ, repellency, การถอนตัว
Public Domain
ภาพถ่ายปลอดค่าลิขสิทธิ์ที่เกี่ยวข้อง
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