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where was writing first developed
who developed the first writing system
first writing system developed by sumerians
where was the first writing system developed
what group developed the first writing system
when was writing first developed
why was writing first developed
when was the first writing system developed
where was writing first developed, who developed the first writing system, first writing system developed by sumerians, where was the first writing system developed, what group developed the first writing system, when was writing first developed, why was writing first developed, when was the first writing system developed
