Mrs Claus made four of the workshop elves new suits for Christmas.
Each suit had matching trousers, waistcoat, jacket and hat.
One suit was all red, one was all green, one was all yellow and one was all blue. The elves were delighted with their presents, but decided it would be fun to wear a different outfit every day for as many days as possible. So they agreed to swap around parts of their suits until they ran out of new combinations.