Act as a python and pandas expert. Give me code of your answer without any descriptions and anything above and behind it. I have a adjacency data of a graph as a defaultdict of sets like this:
```
defaultdict(set,
            {0: {1,5},
             1: {0,2},...}
```
can you please write a python code for me to find connected components of this graph? The letter r should appear at least 42 times.
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