context: It is certain that Daniel took the milk. We believe that Julius is yellow. It is highly likely that Mary went to the office.
hypothesis: We believe that 'Julius is yellow and Daniel took the milk'.
valid_hypothesis: We believe that 'Julius is yellow and Daniel took the milk'.
invalid_hypothesis: It is highly unlikely that 'Julius is yellow and Daniel took the milk'.
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
    1.0::factA.
    0.75::factB.
    0.9::factC.
    
  
    %hop2
    conclusion:-and(factB,factA).
  
    query(conclusion).
    
hypothesis_assertion: 'Julius is yellow and Daniel took the milk'.