339
At the time   a former mauthausen prisoner whom he knew from the concentration camp was the president of  Czechoslovakia  .
 employee of: , Czechoslovakia
Given options, please tell me the relationships of all the listed entity pairs.Output format is "relation1: word1, word2; relation2: word3, word4". 
Option: cities of residence, top members employees, members, alternate names, origin, state or provinces of residence, title of person, spouse, city of headquarters, NA, founded by, state or province of headquarters, employee of, countries of residence, country of birth, founded, subsidiaries, country of headquarters 
Text: {0} 
 Entity Pairs:  , Czechoslovakia 
Answer:
 employee of: , Czechoslovakia