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'John' and Last_Name 'Doe' and Middle_Name 'Quality').

;Data type checks
:Checks input conformance with typed data. For example, an input box accepting numeric data may reject the letter 'O'.

;File existence check
:Checks that a file with a specified name exists. This check is essential for programs that use file handling.

;Format check
:Checks that the data is in a specified format (template), e.g., dates have to be in the format YYYY-MM-DD. Regular expressions may be used for this kind of validation.

;Presence

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