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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.
Now that you have solved tha kata, anything to reflect on? Such as, How did you find a way to improve your code? Just curious, thanks.
Think of it in that manner that a century starts at at 1 and goes 100 years. It does not start at 0. So 1 - 100 is that first century, 101 - 200 is that second, and so on.
No worries :) It does feel odd that it's not 1800 to 1899, but it's a weird world!
On Wikipedia it says the 19th century covers 1801 to 1900 (inclusive):
https://en.wikipedia.org/wiki/19th_century