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SUBMIT YOUR IDEAMy solution:
Number 20
My first attempt to solve this I was going to use binary math:
I had columns set up, 1 for each of the 15 product types, and I was planning to just sum the values of the columns to get a string like : "001001001001001" to represent which products were bought.
Unfortunately I realised that binary math isn't a thing (!!!) and I realised there was an easier way to do this!