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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.
The dead segment is either always on or always off.
All numbers look good.
The dead segment looks like a normal segment, it isn't highlighted or of different color. Finding the dead segment is your task.