context: There is a better than even chance that Greg is a rhino. Chances are about even that Julius is gray. There is a very good chance that Winona is a sheep.
hypothesis: Chances are slight that 'Greg is a rhino' or 'Winona is a sheep' or both.
valid_hypothesis: It is highly likely that 'Greg is a rhino' or 'Winona is a sheep' or both.
invalid_hypothesis: Chances are slight that 'Greg is a rhino' or 'Winona is a sheep' 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
    0.6::factA.
    0.5::factB.
    0.8::factC.
    
  
    %hop2
    conclusion:-or(factA,factC).
  
    query(conclusion).
    
hypothesis_assertion: 'Greg is a rhino' or 'Winona is a sheep' or both.