Write a preprocessor command that uses the #undef command.

Difficulty level
This exercise is mostly suitable for students 
#define DEBUG 1
/* In this section of the program, occurrences of DEBUG */
/* are replaced with 1, and the expression defined( DEBUG ) */
/* evaluates to TRUE. *.
#undef DEBUG
/* In this section of the program, occurrences of DEBUG */
/* are not replaced, and the expression defined( DEBUG ) */
/* evaluates to FALSE. */
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