context: It is unlikely that John left the milk. It is certain that Sandra grabbed the apple. It is probably not the case that Julius is gray.
hypothesis: It is likely that 'Sandra grabbed the apple and Julius is gray'.
valid_hypothesis: It is probably not the case that 'Sandra grabbed the apple and Julius is gray'.
invalid_hypothesis: It is likely that 'Sandra grabbed the apple and Julius is gray'.
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.
    1.0::factB.
    0.25::factC.
    
  
    %hop2
    conclusion:-and(factB,factC).
  
    query(conclusion).
    
hypothesis_assertion: 'Sandra grabbed the apple and Julius is gray'.