During the Sumerian period, token envelop accounting was replaced by flat clay tablets impressed by tokens that merely transferred symbols. Such documents were kept by scribes, who were carefully trained to acquire the necessary literary and arithmetic skills and were held responsible for documenting financial transactions. Such records preceded the earliest found examples of cuneiform writing in the form of abstract signs incised in clay tablets, which were written in Sumerian by 2900 BCE in Jemdet Nasr. Therefore "token envelop accounting" not only preceded the written word but constituted the major impetus in the creation of writing and abstract counting.
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