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\\)