From: brueck@FernUni-Hagen.de   
      
   Hi, I have a question regarding FOIL (First Order Inductive Learner).   
   I tried a simple example program which I cannot get to run:   
   FOIL should learn the concept of brother   
   The learned rule should look like   
   brother(X,Y):-parent(Z,X) and parent(Z,Y) and male(X) and X<>Y   
      
   Unfortunately I always get the result:   
      
   No literals   
      
   Clause too inaccurate (2/4)   
      
   Thanks for any help. A link to a good introduction into FOIL would also   
   be helpful.   
      
   -------------   
   Tim   
      
   There is my program code:   
      
   X: 1, 2, 3, 4, 5, 6, 7.   
   Y: 1, 2, 3, 4, 5, 6, 7.   
      
   brother(X,Y) ##   
   2,3   
   6,7   
      
   3,2   
   5,4   
   2,1   
   3,1   
   4,2   
   4,3   
   1,2   
   1,3   
   4,5   
   5,7   
   .   
   *parent(X,Y) ##   
   1,2   
   1,3   
   4,5   
   4,6   
   4,7   
      
   5,4   
   2,1   
   3,1   
   4,2   
   4,3   
   6,7   
   .   
   *male(X) #   
   2   
   4   
   5   
      
   3   
   1   
   6   
   .   
      
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