So the plan is: iterate through each word, check if it's part of a proper noun (like the book title or person's name). If not, replace it with three variants using spintax. For example, the first sentence: "Software testing is a systematic and thorough process..." Replace "Software" with w1, "testing" with t1, and so on. But make sure when the title is mentioned, those words are left as-is.
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I have to be careful not to alter the meaning. Replacing "reputable source" with "authentic origin" might not be as clear. Maybe "trusted website" is better. Also, proper nouns like Google Books, Academia.edu, and ResearchGate must remain unchanged. So the plan is: iterate through each word,
"Functional Testing" → Operational Testing But make sure when the title is mentioned,
In the example, the original text is:
: Test case development involves creating detailed test cases that cover the testing scope. Test cases should be designed to validate the software application’s functionality, performance, and security. ... Maybe "trusted website" is better