context: There is almost no chance that Julius is green. It is likely that Sandra dropped the milk. We believe that John went to the garden.
hypothesis: It is likely that 'Sandra dropped the milk' or 'Julius is green' or both.
valid_hypothesis: It is likely that 'Sandra dropped the milk' or 'Julius is green' or both.
invalid_hypothesis: We doubt that 'Sandra dropped the milk' or 'Julius is green' 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
    0.02::factA.
    0.7::factB.
    0.75::factC.
    
  
    %hop2
    conclusion:-or(factB,factA).
  
    query(conclusion).
    
hypothesis_assertion: 'Sandra dropped the milk' or 'Julius is green' or both.