The following four operations play a major role in this text:
1.Traversing: Accessing each record exactly once so that certain items in the record may be processed.
2.Searching: Finding the location of the record with a given key value, or finding the locations of all records which satisfy one or more conditions.
3.Inserting: Adding a new record of the structure.
4.Deleting:Removing a record from the structure.
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