194523
The Westphalian age is preceded by the Namurian stage/age ( which corresponds to the Millstone Grit Series of Great Britain ) and succeeded by the Stephanian stage/age ( which corresponds to the uppermost part of the Coal Measures of Great Britain ) .
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Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
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