context: We believe that Lily is green. It is impossible that Bernhard is yellow. It is almost certain that John went to the office.
hypothesis: It is likely that 'Lily is green and John went to the office'.
valid_hypothesis: It is likely that 'Lily is green and John went to the office'.
invalid_hypothesis: It is unlikely that 'Lily is green and John went to the office'.
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.
    0.0::factB.
    0.95::factC.
    
  
    %hop2
    conclusion:-and(factA,factC).
  
    query(conclusion).
    
hypothesis_assertion: 'Lily is green and John went to the office'.