context: We believe that Brian is white. There is a better than even chance that John discarded the apple. It is almost certain that Mary went to the hallway.
hypothesis: It is probable that 'Mary went to the hallway and Brian is white'.
valid_hypothesis: It is probable that 'Mary went to the hallway and Brian is white'.
invalid_hypothesis: There is almost no chance that 'Mary went to the hallway and Brian 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
    0.75::factA.
    0.6::factB.
    0.95::factC.
    
  
    %hop2
    conclusion:-and(factC,factA).
  
    query(conclusion).
    
hypothesis_assertion: 'Mary went to the hallway and Brian is white'.