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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.
As I understand it, you are correct, and this is not a good idea when iterating in the normal forward direction through a list...
However, this can be solved by iterating thorugh the list in reverse
See my example using enumerate(reversed(lst))