context: Chances are slight that Sumit is thirsty. It is probably the case that Bernhard is a swan. It is almost certain that Fred went to the garden.
hypothesis: It is almost certain that 'Sumit is thirsty' or 'Fred went to the garden' or both.
valid_hypothesis: It is almost certain that 'Sumit is thirsty' or 'Fred went to the garden' or both.
invalid_hypothesis: We doubt that 'Sumit is thirsty' or 'Fred went to the garden' 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
    0.1::factA.
    0.7::factB.
    0.95::factC.
    
  
    %hop2
    conclusion:-or(factA,factC).
  
    query(conclusion).
    
hypothesis_assertion: 'Sumit is thirsty' or 'Fred went to the garden' or both.