context: We believe that Mary moved to the garden. It is highly likely that Brian is green. It is improbable that Daniel took the milk.
hypothesis: Chances are slight that 'Brian is green and Daniel took the milk'.
valid_hypothesis: Chances are slight that 'Brian is green and Daniel took the milk'.
invalid_hypothesis: There is a better than even chance that 'Brian is green 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
    0.75::factA.
    0.9::factB.
    0.1::factC.
    
  
    %hop2
    conclusion:-and(factB,factC).
  
    query(conclusion).
    
hypothesis_assertion: 'Brian is green and Daniel took the milk'.