context: It is probably not the case that John went to the garden. It is almost certain that Gertrude is a cat. Chances are slight that Mary picked up the apple.
hypothesis: It is improbable that 'Mary picked up the apple and Gertrude is a cat'.
valid_hypothesis: It is improbable that 'Mary picked up the apple and Gertrude is a cat'.
invalid_hypothesis: It is almost certain that 'Mary picked up the apple and Gertrude is a cat'.
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
    0.25::factA.
    0.95::factB.
    0.1::factC.
    
  
    %hop2
    conclusion:-and(factC,factB).
  
    query(conclusion).
    
hypothesis_assertion: 'Mary picked up the apple and Gertrude is a cat'.