context: There is almost no chance that Jeff went to the garden. It is certain that Lily is white. Chances are about even that John put down the apple.
hypothesis: It is almost certain that 'Lily is white and Jeff went to the garden'.
valid_hypothesis: There is almost no chance that 'Lily is white and Jeff went to the garden'.
invalid_hypothesis: It is almost certain that 'Lily is white and Jeff went to the garden'.
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
    0.02::factA.
    1.0::factB.
    0.5::factC.
    
  
    %hop2
    conclusion:-and(factB,factA).
  
    query(conclusion).
    
hypothesis_assertion: 'Lily is white and Jeff went to the garden'.