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.
1 The harder a cheese, the less lactose it has. Lactose is found in the watery part of milk, and since harder cheeses have less liquid, that means they contain less lactose. Extra sharp cheddar, Parmesan, Pecorino, aged gouda and other very hard cheeses have essentially no lactose.  Lactase-fortified dairy products.