## Problem Statement

Given a reference of a node in a connected undirected graph, return a deep copy (clone) of the graph. Each node in the graph contains a value (`int`) and a list (`List[Node]`) of its neighbors.

#### Example 1:
**Input:** 
```
    1--2
    |  |
    4--3
```
**Expected Output:**
```
    1--2
    |  |
    4--3
```
**Explanation:** 
The graph has four nodes with the following connections:
- Node `1` is connected to nodes `2` and `4`.
- Node `2` is connected to nodes `1` and `3`.
- Node `3` is connected to nodes `2` and `4`.
- Node `4` is connected to nodes `1` and `3`.


#### Example 2:
**Input:** 
```
    1--2
   /    \
  5      3
         |
         4
```
**Expected Output:**
```
    1--2
   /    \
  5      3
         |
         4
```
**Explanation:** 
The graph consists of five nodes with these connections:
- Node `1` is connected to nodes `2` and `5`.
- Node `2` is connected to nodes `1` and `3`.
- Node `3` is connected to nodes `2` and `4`.
- Node `4` is connected to node `3`.
- Node `5` is connected to node `1`.


#### Example 3:
**Input:** 
```
    1--2
   /    \
  4      3
   \    /
    5--6
```
**Expected Output:**
```
    1--2
   /    \
  4      3
   \    /
    5--6
```
**Explanation:** 
The graph has six nodes with the following connections:
- Node `1` is connected to nodes `2` and `4`.
- Node `2` is connected to nodes `1` and `3`.
- Node `3` is connected to nodes `2` and `6`.
- Node `4` is connected to nodes `1` and `5`.
- Node `5` is connected to nodes `4` and `6`.
- Node `6` is connected to nodes `3` and `5`.


## Try it yourself

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