context: There is almost no chance that Lily is gray. It is unlikely that Sandra put down the milk. There is a better than even chance that Julius is yellow.
hypothesis: It is probable that 'Sandra put down the milk and Julius is yellow'.
valid_hypothesis: It is improbable that 'Sandra put down the milk and Julius is yellow'.
invalid_hypothesis: It is probable that 'Sandra put down the milk and Julius is yellow'.
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
    0.02::factA.
    0.2::factB.
    0.6::factC.
    
  
    %hop2
    conclusion:-and(factB,factC).
  
    query(conclusion).
    
hypothesis_assertion: 'Sandra put down the milk and Julius is yellow'.