How did the Inca communicate throughout their empire without having a written language?

A quipu/knot record, was one of the ways Incas had kept records to communicate. It was a simple and portable device, that achieved lots of precision and flexibility. The Incas didn't have an alphabetical communication system.

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a yes vote means: the legislature, with a two-thirds vote, could change daylight saving time if the change is allowed by the federal government. absent any legislative change, california would maintain its current daylight saving time period