Inca's peculiar mode of recording information

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The Inca civilization is known for a well-structured civilization. They built strong fronts and maintained a large army. They were not having any special mode script. However, they used a very peculiar way of recording the information in place of a script. They used strings and knots as a mode of writing. Each device was a cord was known as quipu. It has got many colored strings attached to it The string, the knot and the spacing between the knots each was conveying its own meaning. But, so far this has not been deciphered so far.