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1. Takes a user input (like a word, sentence, or pattern). 2. Gradually modifies its own source code so that it becomes that input. 3. Because it rewrites its own code, after running once, the original logic is gone — so it can’t run the same way again. So “you can only run it once” means: • The first time it runs, it changes its own file. • After that, the program’s structure is different (maybe completely replaced by the user input). • So it no longer behaves like the original program. This is called a self-modifying program