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Sophie wrote to us to say:
I spent a lot of time working on this solution. You should do 4 x 4 x 4 x 4, this equals 256. Therefore the elves would not run out of combinations until 256 days worth of different suits. Me and my school agreed on this as the answer.I asked Sophie if she could explain a little bit more about why she did 4x4x4x4 as I thought it would help other people reading the solution. She wrote back to me:
Thank you Sophie for your messages. Yasmin from Bancroft Prep School sent the following which might help to explain why 4x4x4x4 works:
This practical challenge invites you to investigate the different squares you can make on a square geoboard or pegboard.