context: It is probably not the case that Julius is green. There is almost no chance that John went to the office. It is likely that Greg is white.
hypothesis: It is impossible that 'John went to the office and Julius is green'.
valid_hypothesis: It is impossible that 'John went to the office and Julius is green'.
invalid_hypothesis: It is almost certain that 'John went to the office and Julius is green'.
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
    0.25::factA.
    0.02::factB.
    0.7::factC.
    
  
    %hop2
    conclusion:-and(factB,factA).
  
    query(conclusion).
    
hypothesis_assertion: 'John went to the office and Julius is green'.