| Class | Description | 
|---|---|
| BasicProgramBlock | |
| ForProgramBlock | |
| FunctionProgramBlock | |
| IfProgramBlock | |
| LocalVariableMap | Replaces  HashMap〈String, Data〉as the table of
 variable names and references. | 
| ParForProgramBlock | The ParForProgramBlock has the same execution semantics as a ForProgamBlock but executes
 the independent iterations in parallel. | 
| ParForProgramBlock.PartitionFormat | Convenience class to package PDataPartitionFormat and its parameters. | 
| Program | |
| ProgramBlock | |
| WhileProgramBlock | 
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