1. 8 Subprograms
    1. Overview
    2. Procedures
    3. Functions
    4. Subprograms in general
    5. Parameter modes
    6. In mode
    7. In out mode
    8. Out mode
    9. Named parameters
    10. Mixing positional and named parameters
    11. Default parameter values
    12. Local subprograms
    13. Separate compilation
    14. Overloading
    15. Subprogram overloading
    16. Operator overloading

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