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I only saw one there doing back to back tours. I didn't do the tour, sorry, so can't comment further.
[list][*]Norwegian Star (Norwegian Capricon Line) 1999 (I think)[*]Pacific Princess (December 2005)[*]Pacific Star (3 Feb 2007)[*]Voyager of the Seas (2014)[*]Rhapsody of the Seas (April 2015)[*]Explorer of the Seas (March 2016)[*]Legend of the Seas (January 2017)