A natural quantity is a characteristic of a collection, used to describe its measurement (how it is several) and distinguish it from other collections. is really a commutative monoid with identification component 0. It is just a free monoid on just one generator. This commutative monoid satisfies the cancellation house, https://herbalmedicinesonline.news.blog/2025/09/03/cureayu-natural-healthcare-solutions-for-mind-body-balance/