The rule of the function normally applies to words that are related to individuals in some way, such as people's names (e.g., "Marco Rubio", "Lena", "Adam"). For these inputs, the function outputs a specific category or description. However, for words that represent other concepts like locations (e.g., "Tokyo", "Rhine"), countries (e.g., "Spain"), animals (e.g., "Wolf"), or compound concepts (e.g., "South Korea"), the function does not provide a meaningful output and instead returns "undefined". The corruption in the domain occurs when the input word does not relate to individuals, leading to an undefined output.