What do the numbers in the small circles mean?
For example the green 10, the orange 8 and hte blue 21?
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Blue: Review / water (you have to water the planted flower)
Orange: Difficult words
Green: Remaining words to learn
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However I can not explain to you how these graphics / colours map to the mobile app outerspace schema and to explore or conquer new planets 
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What do difficult words mean?
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