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In computer science a hash table or hash map is a data structure that uses a hash function to map identifying values known as keys eg a persons name to their associated values eg their telephone number Rehashing Double hashing is a computer programming technique used in hash tables to resolve hash collisions cases when two different values to be searched for produce the same hash key It is a popular collisionresolution technique in openaddressed hash tables Something reworked or made up from old materials To rework old material physical material ideas documents etc redo some work with some variations rehashing insert C and Pascal search C and Pascal to apply a different hashing function to a key when a collision occurs