context: We believe that Winona is a mouse. It is improbable that Brian is a swan. It is likely that John moved to the office.
hypothesis: It is almost certain that 'John moved to the office' or 'Winona is a mouse' or both.
valid_hypothesis: It is almost certain that 'John moved to the office' or 'Winona is a mouse' or both.
invalid_hypothesis: There is almost no chance that 'John moved to the office' or 'Winona is a mouse' 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
    0.75::factA.
    0.1::factB.
    0.7::factC.
    
  
    %hop2
    conclusion:-or(factC,factA).
  
    query(conclusion).
    
hypothesis_assertion: 'John moved to the office' or 'Winona is a mouse' or both.