context: It is almost certain that John discarded the apple. It is certain that Sandra got the football. It is likely that Gertrude is a mouse.
hypothesis: It is probably the case that 'Gertrude is a mouse and Sandra got the football'.
valid_hypothesis: It is probably the case that 'Gertrude is a mouse and Sandra got the football'.
invalid_hypothesis: It is probably not the case that 'Gertrude is a mouse and Sandra got the football'.
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
    0.95::factA.
    1.0::factB.
    0.7::factC.
    
  
    %hop2
    conclusion:-and(factC,factB).
  
    query(conclusion).
    
hypothesis_assertion: 'Gertrude is a mouse and Sandra got the football'.