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Use "quipus" in a sentence
"An Inka accounting system that used knotted strings called quipus to record numerical data has long been known to scholars."
"In other words, we are seeing a president of a XXI century country propose to go back to an economical system which had been even overcome long ago, even by the Incas: they might not have had real currency or writing but they had the quipus and efficient central planning with extensive intra regional trading."
"It's been generally assumed that the quipus are largely accounting records for decades at least."