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You can use new IterableZip([it1, it2, it3]) to generate an iterable of three-element lists, one from each source iterable, as long as all three source iterables have an element. Similar functionality for streams is provided by StreamZip. R=floitsch@google.com Review URL: https://codereview.chromium.org//18015002 git-svn-id: https://dart.googlecode.com/svn/branches/bleeding_edge/dart@24835 260f80e4-7a28-3924-810f-c04153c831b5