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Constitutional reforms were proposed on Tuesday by two senators , one of them a member of Samper 's own Liberal Party , aimed at lifting the ban on extradition introduced in 1991 .
 Samper, Liberal Party
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, else, organization, person 
Text: {0} 
Answer:
 Samper, Liberal Party