Here's the completed code:
```
# Import defaultdict
from collections import defaultdict
# Save the fifth document: doc
doc = corpus[4]
# Sort the doc for frequency: bow_doc
bow_doc = sorted(doc, key=lambda w: w[1], reverse=True)
# Print the top 5 words of the document alongside the count
for word_id, word_count in bow_doc[:5]:
print(dictionary.get(word_id), word_count)
# Create the defaultdict: total_word_count
total_word_count = defaultdict(int)
for word_id, word_count in itertools.chain.from_iterable(corpus):
total_word_count[word_id] += word_count
# Create a sorted list from the defaultdict: sorted_word_count
sorted_word_count = sorted(total_word_count.items(), key=lambda w: w[1], reverse=True)
# Print the top 5 words across all documents alongside the count
for word_id, word_count in sorted_word_count[:5]:
print(dictionary.get(word_id), word_count)
```
The code creates a sorted list called `sorted_word_count` by using `sorted()` on `total_word_count.items()`. It then prints the top five words and their counts using a for loop.