👉 In mathematics, a countersank is a type of graph that can be used to represent a number in a way that does not require any additional information about its position. Specifically, it is a graph where each node represents an integer and there is exactly one edge between two nodes if the integers on both sides of the edge are equal. For example, consider the following graph: ``` 1 / \ / \ 2 3 ``` This graph has six nodes (1