context: It is highly likely that Jason is thirsty. It is impossible that Bernhard is a swan. It is unlikely that Winona is a wolf.
hypothesis: Chances are slight that 'Bernhard is a swan' or 'Jason is thirsty' or both.
valid_hypothesis: It is highly likely that 'Bernhard is a swan' or 'Jason is thirsty' or both.
invalid_hypothesis: Chances are slight that 'Bernhard is a swan' or 'Jason is thirsty' 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
    0.9::factA.
    0.0::factB.
    0.2::factC.
    
  
    %hop2
    conclusion:-or(factB,factA).
  
    query(conclusion).
    
hypothesis_assertion: 'Bernhard is a swan' or 'Jason is thirsty' or both.