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Each time you run the program, confirm that the program executes its statements in the correct sequence and that the output is correct. As an aid in analyzing the execution of your program, you can include SHOW
or TRACE statements in the program to produce diagnostic or status messages. Then delete the these
statements after your tests are complete.
When you detect or suspect an error in your program or a nested program, you can track down the error by using the debugging techniques that are described in the rest of this section.