context: There is little chance that Julius is gray. It is probably not the case that Mary went to the office. It is unlikely that John put down the milk.
hypothesis: There is almost no chance that 'Mary went to the office and Julius is gray'.
valid_hypothesis: There is almost no chance that 'Mary went to the office and Julius is gray'.
invalid_hypothesis: Chances are about even that 'Mary went to the office and Julius is gray'.
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.
    0.25::factB.
    0.2::factC.
    
  
    %hop2
    conclusion:-and(factB,factA).
  
    query(conclusion).
    
hypothesis_assertion: 'Mary went to the office and Julius is gray'.