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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.
I first saw this way to save the options on web form(many many "yes" and "no" options on admin form) was the VBB(vBulletin BBS in PHP https://www.vbulletin.com/), that's the way how they compress and save various options in just one int columen in mysql table.
10101010111 is same as many "yes" "no" checbox on web forms.
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