context: It is unlikely that Fred is in the office. There is a very good chance that Brian is white. There is a very good chance that Mary took the milk.
hypothesis: It is unlikely that 'Brian is white and Fred is in the office'.
valid_hypothesis: It is unlikely that 'Brian is white and Fred is in the office'.
invalid_hypothesis: There is a very good chance that 'Brian is white and Fred is in the office'.
problog: 
    and(A,B) :- A,B.
    or(A,B) :- A;B.
    nand(A,B) :- not(and(A,B)).
    nor(A,B) :- not(or(A,B)).
    xor(A,B) :- or(A,B), nand(A,B).
  
    %hop0
    0.2::factA.
    0.8::factB.
    0.8::factC.
    
  
    %hop2
    conclusion:-and(factB,factA).
  
    query(conclusion).
    
hypothesis_assertion: 'Brian is white and Fred is in the office'.