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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.
write "string" with lowercase "s"
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True, but performance isn't an issue and code clarity is more important. I managed to increase the execution time to over a second by multiplying up both input strings until the length was over 16MiB (each) - if that's likely to occur in production code, it could be tweaked accordingly.
Test5 and Test9 has more than one different numbers.