context: There is little chance that Mary grabbed the milk. There is a better than even chance that Fred discarded the apple. We believe that Lily is white.
hypothesis: Chances are about even that 'Fred discarded the apple and Lily is white'.
valid_hypothesis: Chances are about even that 'Fred discarded the apple and Lily is white'.
invalid_hypothesis: It is almost certain that 'Fred discarded the apple and Lily is white'.
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
    0.1::factA.
    0.6::factB.
    0.75::factC.
    
  
    %hop2
    conclusion:-and(factB,factC).
  
    query(conclusion).
    
hypothesis_assertion: 'Fred discarded the apple and Lily is white'.