A complicated issue, a complex situation. When we use these adjectives we do not ask ourself the question on their exact meaning. Apparently one can be substituted for the other without modifying the sense of the subject. But in fact, it is just what it seems to be. We can then wonder why we have got two terms to express the same thing ? I suggest we take a moment thinking about the nuance between both. Then we shall see the importance which it can have to approach the problem solving.
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