9033
He worked for Ziff-Davis as the editor of Amazing Stories and did not leave until the end of 1949 but he launched two magazines under the Clark name before that date : Fate in the spring of 1948 and  Other Worlds  the first issue of which was dated  November 1949  .
 founded: Other Worlds, November 1949
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:  Other Worlds, November 1949 
Answer:
 founded: Other Worlds, November 1949