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He strongly influenced the politicians Francis William Reitz and Martinus Theunis Steyn , serving as a mentor for the two men who later became Presidents of the Orange Free State .
 Francis William Reitz, Martinus Theunis Steyn
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 Francis William Reitz, Martinus Theunis Steyn