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A Hash_key is a small value that is used to represent a large piece of data in a hash system. A hash function is a mathematical equation that simplifies large amounts of data into small values. This process saves space in a database and makes retrieving information faster and easier for the programs. It is also common to use hash systems to locate repeating information in complex systems, like a repeated voice or image pattern or even repeated portions of a genome or deoxyribonucleic acid DNA strand.

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