context: We doubt that John went to the garden. It is almost certain that Jessica is a cat. There is a better than even chance that Mary dropped the milk.
hypothesis: We doubt that 'John went to the garden and Jessica is a cat'.
valid_hypothesis: We doubt that 'John went to the garden and Jessica is a cat'.
invalid_hypothesis: We believe that 'John went to the garden and Jessica is a cat'.
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
    0.2::factA.
    0.95::factB.
    0.6::factC.
    
  
    %hop2
    conclusion:-and(factA,factB).
  
    query(conclusion).
    
hypothesis_assertion: 'John went to the garden and Jessica is a cat'.