"id","pid","subject"
1,0,"Food"
2,1,"Beans and Nuts"
3,2,"Beans"
4,2,"Nuts"
5,3,"Black Beans"
6,4,"Pecans"
7,3,"Kidney Beans"
8,7,"Red Kidney Beans"
9,7,"Black Kidney Beans"
10,1,"Dairy"
11,10,"Beverages"
12,11,"Whole Milk"
13,11,"Skim Milk"
14,10,"Cheeses"
15,14,"Cheddar"
16,14,"Stilton"
17,14,"Swiss"
18,14,"Gouda"
19,14,"Muenster"
20,11,"Coffee Milk"
21,0,"Not Food!"