The function f(x) appears to be selective for multiple concepts, such as:
1. Emotions and feelings (e.g., sad, depression)
2. Colors (e.g., blue)
3. Natural phenomena related to water (e.g., ocean, rain)
4. Technology and programming (e.g., algorithm, programming, computer)
5. Temperature (e.g., hot)
6. Conflicts and communication (e.g., conflict, communication, war, language)

Most of the words related to these concepts generate higher output values, indicating a stronger association with the respective concepts.