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Little Blue and Little Yellow by Leo Lionni
References to this work on external resources.
Wikipedia in English
Amazon.com Product Description (ISBN 0688132855, Paperback)
Little blue and little yellow share wonderful adventures. One day, they can't find one another. When they finally meet, they are overjoyed. They hug until they become green. But where did little blue and little yellow go? Are they lost?
(retrieved from Amazon Thu, 14 Feb 2013 13:49:22 -0500)
A little blue spot and a little yellow spot are best friends, and when they hug each other they become green.
(summary from another edition)
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