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Represent the shaded area in the drawing with the appropriate fraction.
[Graphs generated by this script: setBorder(0); initPicture(-0.25,5.25,-0.25,15.25);stroke="black";fill="cyan";rect([0,0],[5,5]);fill="white";rect([0,5],[5,10]);fill="cyan";rect([0,10],[5,15]);]
`2/3`