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This will let us use 'c' for continue even though it is ambiguous. Add aliases to the 'help' output. BUG= R=johnmccutchan@google.com Review URL: https://codereview.chromium.org//984683002 git-svn-id: https://dart.googlecode.com/svn/branches/bleeding_edge/dart@44269 260f80e4-7a28-3924-810f-c04153c831b5