You should use as many keywords as possible on your web pages.

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Keywords that are not found in the text of your web site are likely to be ignored by the search engine. If the search engine thinks all of these words are just SPAM, that may hurt you. Pick your keywords to match your content and do not over use them. Search engines look at the number of times a keyword is used on a page. Some people say that the search engines have word count ratios (percentages), and if a keyword appears more than that number of times, it can hurt your ranking.