1640
Campbell hosted  Sierra Leone  's President  Joseph Saidu Momoh  for the Gullah Reunion at Penn Center in 1988 and led the historic Gullah Homecoming to Sierra Leone in 1989 .
 employee of: Sierra Leone, Joseph Saidu Momoh
Given a phrase that describes the relationship between two words, extract the words and the lexical relationship between them. The output format should be "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} 
Answer:
 employee of: Sierra Leone, Joseph Saidu Momoh