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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.
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I think that your understanding of "decimal numbers" and "32-bit numbers" is not exactly right. Test cases do not require you to require "a decimal number", but just a number. Representation, decimal or any other, is irrelevant here. And
2149583361can be described as "32-bit number" if it can be stored with 32 bits of information (which it can).Final line of instructions could be rewritten to be less misleading...
"Because the above IP address has 32 bits, we can represent it as the 32 bit number: 2149583361."
The test cases require us to return a decimal number and this sounds like it's asking for a 32-bit number.
Once I'd figured that out, I enjoyed it though - thanks