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In my last post, Dan Lewis (my friend and former coworker) responded with some counter-code from Google’s collections package. Instead of attempting to snap back with some witty technical retort, I challenged Dan to a code-off. Groovy collections vs. Google collections (in Java). Here is round one, and I’m going first with an example of finding combinations of collections. Hopefully, you can soon find Dan’s response in Google collection code-style on his blog.