An example of a triangle diagram appears to the right. An organizational chart is the diagram of a hierarchy within an organization, and is depicted in tree form below.
Cow's milk can range from 3.7 to 5.1% lactose, although most milk in the U.S. is around 5%. So water buffalo milk may be slightly lower in lactose but not significantly so. I certainly wouldn't call it a low lactose product.
Goat's milk does contain lactose and it has almost as much as cow's milk. Cheeses made from both cow's milk and goat's milk will have a reduction in the amount of lactose due to the fermentation process. For this reason many people who are lactose intolerant are able to eat cheeses.