context: It is highly unlikely that Mary went to the kitchen. We doubt that Jeff discarded the milk. It is improbable that John put down the apple.
hypothesis: There is almost no chance that 'John put down the apple and Jeff discarded the milk'.
valid_hypothesis: There is almost no chance that 'John put down the apple and Jeff discarded the milk'.
invalid_hypothesis: It is almost certain that 'John put down the apple and Jeff discarded 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
    0.05::factA.
    0.2::factB.
    0.1::factC.
    
  
    %hop2
    conclusion:-and(factC,factB).
  
    query(conclusion).
    
hypothesis_assertion: 'John put down the apple and Jeff discarded the milk'.