context: It is highly unlikely that Julius is green. It is certain that Gertrude is a sheep. Chances are about even that John went to the kitchen.
hypothesis: Chances are about even that 'Julius is green' or 'John went to the kitchen' or both.
valid_hypothesis: Chances are about even that 'Julius is green' or 'John went to the kitchen' or both.
invalid_hypothesis: There is almost no chance that 'Julius is green' or 'John went to the kitchen' or both.
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.
    1.0::factB.
    0.5::factC.
    
  
    %hop2
    conclusion:-or(factA,factC).
  
    query(conclusion).
    
hypothesis_assertion: 'Julius is green' or 'John went to the kitchen' or both.