The data items to be used in a User Language Program must be defined before they can be used.

There are three kinds of definitions:

The scope of a constant or variable definition goes from the line in which it has been defined to the end of the current block, or to the end of the User Language Program, if the definition appeared outside any block.

The scope of a function definition goes from the closing brace (}) of the function body to the end of the User Language Program.

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