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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.
Better to move Math to implementation section. Why? If you are familiar with C/C++ the interface section is like an .h file, the implementation section is like the .c file. Since nothing in the interface needs math to define the interface its more prudent to move to the implementation section. Think of it it in terms of C as rather including .h files in .c files than .h files in other .h files