I am used to write , my color is blue, and I cant be erased. What am I ?, I have four legs , you write and put your stuff on me. What am I?, I am always on your back ,you use me to carry all your books and things . What am I ?, I have a rectangular shape ,and I am full of information.What am I ?, Teachers write on me with diffrent colors to explain things .What am I ?, You can use me to draw or to write ,and if you do a mistake i can be erased.What am I ?

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