चॉकबोर्ड, ब्लैकबोर्ड, स्केच, चाक, कामचोर, बच्चे, खुश, हंसमुख, शिक्षात्मक, मुस्कुराओ, मुस्कराते हुए
Public Domain
प्रासंगिक तस्वीरें
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