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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.
Well, half of all problems are deciphering what the author wants you to do, don't feel bad :P
Basically the question boils down to: How many chunks of 5 can you get out of
n
. Each full chunk is represented by'e <br>'
in the solution. The remainder is thus represented asa, b, c, d
depending on what it is.