Iterating over Example

Iterating over Example

Iteration in the `Example` class also functions like a dictionary, supporting methods like `keys()`, `values()`, etc: 

```python
for k, v in article_summary.items():
    print(f"{k} = {v}")
```

**Output**

```text
context = This is an article.
question = This is a question?
answer = This is an answer.
rationale = This is a rationale.
```