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مدرسه توسعه پایدار Telegram News
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Telegram iOS app: In the “Chats” tab, click the new message icon in the right upper corner. Select “New Channel.” Choose quality over quantity. Remember that one high-quality post is better than five short publications of questionable value. The optimal dimension of the avatar on Telegram is 512px by 512px, and it’s recommended to use PNG format to deliver an unpixelated avatar. The best encrypted messaging apps
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