The function f(x) is selective for the concepts "card games", "Lake Superior", and "mountains". It associates the word "card games" with a score of 0.1541, "Lake Superior" with a score of 0.0770, and "mountains" with a score of 0.1541. The function seems to be more sensitive to the word "card games" than the other two concepts.

Please let me know if you would like to run more tests or if you have any questions.