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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 would change the description a bit: it's better to specify that we are looking for the number of intersections of perperndicular lines. Or it can be worded as 'find the number of pairs of perpendicular lines'.
Nice Kata, thanks! Want to note that tests use 'last_activity' naming while the example provided contains 'lastActivity'. Not a big deal, but still. (Python)