context: There is a very good chance that Jeff went to the garden. There is a better than even chance that Brian is a lion. It is unlikely that John dropped the milk.
hypothesis: Chances are slight that 'John dropped the milk' or 'Brian is a lion' or both.
valid_hypothesis: It is likely that 'John dropped the milk' or 'Brian is a lion' or both.
invalid_hypothesis: Chances are slight that 'John dropped the milk' or 'Brian is a lion' or both.
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
    0.8::factA.
    0.6::factB.
    0.2::factC.
    
  
    %hop2
    conclusion:-or(factC,factB).
  
    query(conclusion).
    
hypothesis_assertion: 'John dropped the milk' or 'Brian is a lion' or both.