context: It is almost certain that Mary went to the hallway. It is probably the case that Jessica is a cat. It is improbable that Julius is a swan.
hypothesis: There is a very good chance that 'Mary went to the hallway and Julius is a swan'.
valid_hypothesis: It is improbable that 'Mary went to the hallway and Julius is a swan'.
invalid_hypothesis: There is a very good chance that 'Mary went to the hallway and Julius is a swan'.
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.
    0.7::factB.
    0.1::factC.
    
  
    %hop2
    conclusion:-and(factA,factC).
  
    query(conclusion).
    
hypothesis_assertion: 'Mary went to the hallway and Julius is a swan'.