context: It is highly likely that Jessica is a cat. Chances are about even that Gertrude is a cat. There is almost no chance that Sandra dropped the milk.
hypothesis: Chances are about even that 'Gertrude is a cat' or 'Sandra dropped the milk' or both.
valid_hypothesis: Chances are about even that 'Gertrude is a cat' or 'Sandra dropped the milk' or both.
invalid_hypothesis: There is almost no chance that 'Gertrude is a cat' or 'Sandra dropped the milk' 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
    0.9::factA.
    0.5::factB.
    0.02::factC.
    
  
    %hop2
    conclusion:-or(factB,factC).
  
    query(conclusion).
    
hypothesis_assertion: 'Gertrude is a cat' or 'Sandra dropped the milk' or both.