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Since 1988 it has been owned by artist André Heller , and now contains interesting sculptures by Keith Haring , Roy Lichtenstein , and so forth , set among more than 500 species including cactus , edelweiss , fern s including Osmunda regalis , magnolia s , orchid s , water lilies , and trees .
 André Heller, Keith Haring, Roy Lichtenstein
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 André Heller, Keith Haring, Roy Lichtenstein