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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'm experiencing the same in Java 17; Error message mentions that the first component should have brackets in between the tags that ecapsulates the remainding output,
ex) <...le="color: orange">9[715FR329...].
the output examples states: RoboScript.highlight("FFFR345F2LL"); // => "<span style="color: pink">FFF<span style="color: green">R<span style="color: orange">345<span style="color: pink">F<span style="color: orange">2<span style="color: red">LL"
notice there are no brackets.