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Explore languages searching for category and for country United States

*Prolog    1989   String and List Processing Horn clause   United States    
Aquarius Prolog    1989   String and List Processing Horn clause   United States   High performance Prolog 
BAP    1993   Horn clause   United States   Brain Aid Prolog 
Concurrent Prolog    1983   String and List Processing Horn clause   United States    
Darwin    1987   Horn clause   United States   Law-based OO prolog 
d-Prolog    1988   String and List Processing Horn clause   United States   Defeasible Prolog 
lambda-Prolog    1988   String and List Processing Horn clause   United States    
Multilog    1986   Horn clause   United States    
SB-Prolog    1973   String and List Processing Horn clause   United States