#12 how am I suppose to add to the 2d list?

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Hello @cru2z, welcome to the forums! When adding anything to a list, you can use the .append() method:

list_a = ["a", "b"]
print(list_a) >>["a","b","c"]
list_b = [["a","b"],["c","d"]]
print(list_b) >>[["a","b"],["c","d"],["e","f"]]

I notice that the instructions mention something about keeping the 2D list sorted, in which case you may need to insert rather than append the time to the list; in which case Python’s insert method may be helpful.