context: Chances are about even that John went to the hallway. It is probably not the case that Brian is a rhino. It is impossible that Winona is a mouse.
hypothesis: Chances are about even that 'Winona is a mouse' or 'John went to the hallway' or both.
valid_hypothesis: Chances are about even that 'Winona is a mouse' or 'John went to the hallway' or both.
invalid_hypothesis: It is certain that 'Winona is a mouse' or 'John went to the hallway' 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
    0.5::factA.
    0.25::factB.
    0.0::factC.
    
  
    %hop2
    conclusion:-or(factC,factA).
  
    query(conclusion).
    
hypothesis_assertion: 'Winona is a mouse' or 'John went to the hallway' or both.