context: It is almost certain that John left the milk. There is a very good chance that Greg is white. It is probably not the case that Mary went to the bedroom.
hypothesis: It is probably not the case that 'Mary went to the bedroom and John left the milk'.
valid_hypothesis: It is probably not the case that 'Mary went to the bedroom and John left the milk'.
invalid_hypothesis: It is probably the case that 'Mary went to the bedroom and John left the milk'.
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
    0.95::factA.
    0.8::factB.
    0.25::factC.
    
  
    %hop2
    conclusion:-and(factC,factA).
  
    query(conclusion).
    
hypothesis_assertion: 'Mary went to the bedroom and John left the milk'.