context: It is probably not the case that John went to the garden. There is a better than even chance that Lily is a rhino. We doubt that Mary took the milk.
hypothesis: It is improbable that 'Mary took the milk and Lily is a rhino'.
valid_hypothesis: It is improbable that 'Mary took the milk and Lily is a rhino'.
invalid_hypothesis: There is a very good chance that 'Mary took the milk and Lily is a rhino'.
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.
    0.6::factB.
    0.2::factC.
    
  
    %hop2
    conclusion:-and(factC,factB).
  
    query(conclusion).
    
hypothesis_assertion: 'Mary took the milk and Lily is a rhino'.