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Some symbols are given below. Explain those symbols. Which disasters may occur if those symbols are ignored?

https://lh3.googleusercontent.com/-5qOStMCp2JU/YXaWFzrj1mI/AAAAAAAACj4/EVj7DaAtbmAi0gSjXkhYrcUhem7WjBS8ACLcBGAsYHQ/image.png

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