[['country', 'builder', 'location', 'ship', 'class / type'], ['united states', 'john roach and son', 'chester , pennsylvania', 'city of rio de janeiro', 'passenger ship'], ['germany', 'kaiserliche werft wilhelmshaven', 'wilhelmshaven', 'bayern', 'sachsen - class ironclad'], ['united kingdom', 'royal dockyard', 'devonport , devon', 'pegasus', 'doterel - class sloop'], ['united kingdom', 'royal dockyard', 'sheerness', 'gannet', 'doterel - class sloop'], ['norway', 'karljohansverns verft', 'horten', 'nor', 'vale - class gunboat'], ['norway', 'karljohansverns verft', 'horten', 'brage', 'vale - class gunboat'], ['germany', 'a g vulcan', 'stettin', 'wã¼rttemberg', 'sachsen - class ironclad']]
Karljohansverns Verft are the only Builder that built a Gunboat boat on the table
[ENT] are the only [ENT] that built a [ENT] boat on the table