Many languages that allow the headmarked possessive inflection exclude a set of nouns from this phenomenon, termed nonpossessible nouns. This closed class constitutes a limited set of nouns. In order to express the possession of such nouns, they must appear next to a specialized possessive noun. With an abstract or generic meaning, these specialized possessive nouns are marked for possession in place of the nonpossessible noun. In some cases, they may be obligatorily marked for possession. In the majority of languages with such possessive nouns, this set constitutes a closed class, chosen based on the eaning of the non-possessible noun. These possessive nouns, therefore, function as possessive classifiers. In some languages, possessive (classifier) nouns have multiple paradigms to express pragmatic and semantic distinctions.
NoPx: The language does not have possessive marking.
NoNonpossN: Possessive marking exists, but nonpossessible nouns do not exist.
NonpossN: Possessive marking exists, along with both nonpossessible and possessive (classifier) nouns.
 The commentary should include how many such nouns exist, along with a description of their grammatical behavior.