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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 guess the question was not explanatory
or you can get the absolute value: ABS(first::inet - last::inet)
but the question already mention that addresses in 'last' always larger than ones in 'first'
I also guess the instruction was not clear enough