Loading collection data...
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.
print it to the console, then copy/paste
This comment is hidden because it contains spoiler information about the solution
My fault :) I understood that we have to count unique marks :D
~Have a nice coding day
"abaca"?
This one?
not "ababa"..
I don't know how it should return 3 ;-)
Last test should return 3 not 4...