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Introduction to nested lists
Iterating over nested lists
6. Iterating over values
Modifying nested lists
Working with multiple lists
Summary

## Instruction

Great! We already know how to access specific elements in nested lists, but how can we iterate over all the elements? We need nested for loops. Here's an example:

donations = [
[345.0, 287.80, 119.27, 329.30],
[294.25, 349.0, 178.90, 262.34],
[401.0, 456.45, 289.43, 319.27]
]

for day in donations:
for place in day:
print(place)

First, we iterate over days in the donations variable. Because each day is itself a list, we can iterate over each place in each day and print it on a separate line. Pay attention to the indentation – the second for loop is further indented because it is part of the first loop.

## Exercise

Create a set named hackathon_winners. Add all unique team names from the hackathon_results nested list to the set.

### Stuck? Here's a hint!

Use hackathon_winners.add() inside a nested for loop.