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May 2, 2009
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Yes, you can find it in the dictionary: http://oxforddictionaries.com/view/entry/m_en_gb0555450#m_en_gb0555450
Maybe this can be helpful: http://www.chompchomp.com/terms/collectivenoun.htm
You don't have to use it at all, but it might be easier to read if you do. I prefer to use it.
In a way, the hyphens put the words together to form an adjective.
Like, "Black-and-white cat."
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