Last example in Set Comprehensions has incorrect return value

The last example in comprehensions is 

```python
>>> {2**x for x in range(10)}
{32, 1, 2, 4, 8, 16, 32, 64, 128, 256, 512}
```

where the return value should actually be

```python
{1, 2, 4, 8, 16, 32, 64, 128, 256, 512}
```

Not sure where the extra 32 came from.