Which of these brand names has NOT become genericized (used as a generic term) in the English language, still maintaining strong trademark protection?

In the world of marketing and linguistics, certain brands have created such powerful linguistic associations that their names have become generic terms for entire product categories - a process known as 'genericization.' This linguistic phenomenon represents both a triumph of brand recognition and a potential trademark challenge. Test your knowledge about these brand names that have evolved in our everyday language!

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Chapstick (lip balm)
Kleenex (facial tissue)
Nike (athletic shoes)
Google (to search online)