context: It is probably the case that Mary got the apple. It is certain that John went to the office. It is improbable that Jessica is a mouse.
hypothesis: Chances are about even that 'Jessica is a mouse' or 'John went to the office' or both.
valid_hypothesis: It is certain that 'Jessica is a mouse' or 'John went to the office' or both.
invalid_hypothesis: Chances are about even that 'Jessica is a mouse' or 'John went to the office' 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
    0.7::factA.
    1.0::factB.
    0.1::factC.
    
  
    %hop2
    conclusion:-or(factC,factB).
  
    query(conclusion).
    
hypothesis_assertion: 'Jessica is a mouse' or 'John went to the office' or both.