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Collections are a way for you to organize kata so that you can create your own training routines. Every collection you create is public and automatically sharable with other warriors. After you have added a few kata to a collection you and others can train on the kata contained within the collection.
Get started now by creating a new collection.
list.index(num) always return the first index which equal to the num
for example :
a = [2,3,3,2]
a.index(2) -> 0
a.index(3) -> 1
[0, 0]is not a valid answer. Please mark your post as having spoiler content next time, and read this: https://docs.codewars.com/training/troubleshooting/This comment is hidden because it contains spoiler information about the solution