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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.
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The same generator constructs also exists in Python and JS I think :)
You can try the 7x7, to see if it's efficient too. ;)
There is only 1 solution possible, really! :)
If you refer here to the given example: the second row has a hint on the right side (2). Second row can, as a consequence only be 3-4-1-2. With 3-4-2-1 there would be 3 skyscrapers visible from the right side.