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Tip: If you don't belong to the lucky few who possess a photographic memory, write down what you learnt while doing this exercise.
images (scaled down):
https://commons.wikimedia.org/wiki/File:Ishihara_1.PNG
https://commons.wikimedia.org/wiki/File:Ishihara_2.svg
https://commons.wikimedia.org/wiki/File:Ishihara_23.PNG
Welcome Library: https://commons.wikimedia.org/wiki/File:Eight_Ishihara_charts_for_testing_colour_blindness,_Europe_Wellcome_L0059161.jpg
Welcome Library: https://commons.wikimedia.org/wiki/File:Eight_Ishihara_charts_for_testing_colour_blindness,_Europe_Wellcome_L0059158.jpg
Welcome Library: https://commons.wikimedia.org/wiki/File:Eight_Ishihara_charts_for_testing_colour_blindness,_Europe_Wellcome_L0059157.jpg
https://commons.wikimedia.org/wiki/File:Ishihara_3.jpg