I have to make a 4x4 grid using 5 colors. 4 squares are blue, 3 red, 3 green, 3 yellow and 3 white. They have to be arranged so that no two of the same color are in line vertically, horizontally or diagonally.
blue....... white....... blue....... yellow red ........green .......red...........white white........yellow.......blue.........green blue .........green ...... red .........yellow
