Recall the definition of a formal context:

> A **formal context** K is a relation between the objects X and attributes Y. It indicates which attributes apply to which objects. It is represented by a bipartite graph.

In the example given,

* X = {fruit, vegetable}
* Y = {green, yellow, purple}
* K = \\(\lbrace (fruit,orange), (fruit,green), (vegetable,purple) \rbrace\\)