[ubuntu] Is there a font viewer to display different fonts at the same time for comparison?

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http://ubuntuforums.org – My wife wants to see a specific phrase in all the fonts available on the computer, in order to compare the fonts and choose the best one for her purposes. Is there such a program? I've found programs such as Specimen Font Previewer, but they show only one font at a time. The computer is running Ubuntu 12.04. (Hardware)