context: It is impossible that Brian is green. We believe that John left the milk. There is a very good chance that Lily is a swan.
hypothesis: It is almost certain that 'John left the milk' or 'Lily is a swan' or both.
valid_hypothesis: It is almost certain that 'John left the milk' or 'Lily is a swan' or both.
invalid_hypothesis: It is impossible that 'John left the milk' or 'Lily is a swan' 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
    0.0::factA.
    0.75::factB.
    0.8::factC.
    
  
    %hop2
    conclusion:-or(factB,factC).
  
    query(conclusion).
    
hypothesis_assertion: 'John left the milk' or 'Lily is a swan' or both.