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To start with I drew a 4 x 4 grid. In the grid I places 4 saucers of each colour so that It matched the criteria. When they were done I places the tea cups on top so that there was only one green on read and only one red on green and so on. Then I had four tea cups left and I places them on their own colour. Once I had placed the cups on their correct saucers I went through and check and double checked. This is how I did tea cups.