I have this class

```
class Node
{
    public bool is_end;
    public int prefix_count;
    public Node[] child = new Node[26];
}

```

My problem is, the class only creates Nodes if it is necessary, but later in the program, i need to check all the created Nodes, though since i don't know which ones are created, i can't use a cycle for it.

Is there a way for me to know which Nodes are created, is there a code to check if this Node exists or not.