context: It is highly unlikely that Bernhard is a frog. It is likely that Daniel took the football. It is certain that Winona is a wolf.
hypothesis: We doubt that 'Winona is a wolf' or 'Bernhard is a frog' or both.
valid_hypothesis: It is certain that 'Winona is a wolf' or 'Bernhard is a frog' or both.
invalid_hypothesis: We doubt that 'Winona is a wolf' or 'Bernhard is a frog' 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.
    0.7::factB.
    1.0::factC.
    
  
    %hop2
    conclusion:-or(factC,factA).
  
    query(conclusion).
    
hypothesis_assertion: 'Winona is a wolf' or 'Bernhard is a frog' or both.