Programs       Pascal Program Structure
 Subprograms    Procedures and Functions
 Procedures     Subprogram
 Functions      SubProgram
 Parameters     Values Passed to Subprograms
 Labels         Define Labels
 Constants      Define Constants
 Types          Define Data Types
 Variables      Define Variables
 Statements     Pascal Program Instructions
 Null           Does Nothing
 Assignment     Sets Equivalency
 Invocation     Call a Subprogram
 Conditional    Test for Condition
 iterative      Repeat Until Condition Met
 Compound       0 or more Statements