How did jewish scribes check the work done when copies were made of the old testament? savestylesformat instructions?

Prior to the Common Era, there was no system in place to check how accurate copies of the Hebrew Scriptures were when they were recreated. The Jewish scribes came up with a system where the middle letter of the middle word of each and every book was numbered and noted. This provided a quick and very accurate system to check each manuscript. This system allowed texts to be copied and passed around with high accuracy.