context: It is unlikely that Bill left the football. There is almost no chance that Gertrude is a cat. It is highly likely that John went to the hallway.
hypothesis: There is almost no chance that 'John went to the hallway and Gertrude is a cat'.
valid_hypothesis: There is almost no chance that 'John went to the hallway and Gertrude is a cat'.
invalid_hypothesis: It is almost certain that 'John went to the hallway and Gertrude 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.
    0.02::factB.
    0.9::factC.
    
  
    %hop2
    conclusion:-and(factC,factB).
  
    query(conclusion).
    
hypothesis_assertion: 'John went to the hallway and Gertrude is a cat'.