Which playwright was the designer of Blenheim Palace and Castle Howard ?
which playwright was the designer of blenheim palace and castle howard 
FreebaseQA-train-2843.P0 FreebaseQA-train-2843.P1
blenheim palace castle howard
blenheim palace castle howard
m.011xwv m.0sy7q
architecture.structure.architect architecture.structure.architect
m.0122xn
john vanbrugh
m.0122xn
john vanbrugh