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CBE Pt15: Unions, CPW Pt. 7 & 8: Symbol Table and Assignment Expressions
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- __Cleanup of the interface__ for unique strings
- C by example Part 15: __Unions in C__
- C Programming Workout Part 7: Simple implementation of a __symbol table for
  the calculator__.
- C Programming Workout Part 8: Representing __assignment expressions__

:links: Cleanup of the interface -> doc:session19/page02
	Unions in C -> doc:session19/page03
	symbol table for the calculator -> doc:session19/page04
	assignment expressions -> doc:session19/page05