context: We doubt that Jeff went to the garden. It is highly unlikely that Sumit is thirsty. There is a better than even chance that John discarded the milk.
hypothesis: It is likely that 'Jeff went to the garden and Sumit is thirsty'.
valid_hypothesis: There is almost no chance that 'Jeff went to the garden and Sumit is thirsty'.
invalid_hypothesis: It is likely that 'Jeff went to the garden and Sumit is thirsty'.
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.
    0.05::factB.
    0.6::factC.
    
  
    %hop2
    conclusion:-and(factA,factB).
  
    query(conclusion).
    
hypothesis_assertion: 'Jeff went to the garden and Sumit is thirsty'.