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Let's implement a nested list! A nested list is a list that contains another list (i.e.: a list of lists). For example:

nested_list = [['blue', 'green'], ['red', 'black'], ['blue', 'white']]
print len(nested_list)
# prints 3
print nested_list[1]
# prints ['red', 'black']
print nested_list[1][0]
# prints red

To go through every element in a list, use a nested for loop.

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