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The predictive value of random sampling of subsets of plants is compared to the study of the entire Swiss flora , to show that a credible estimate of the extent of prior studies can be achieved with just 5 % of these species .
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Please list all entity words in the text that fit the category.Output format is "type1: word1; type2: word2". 
Option: Chemical 
Text: {0} 
Answer:
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