context: There is a better than even chance that Julius is a lion. There is little chance that Lily is gray. It is likely that John dropped the apple.
hypothesis: We believe that 'Lily is gray' or 'John dropped the apple' or both.
valid_hypothesis: We believe that 'Lily is gray' or 'John dropped the apple' or both.
invalid_hypothesis: It is highly unlikely that 'Lily is gray' or 'John dropped the apple' 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.
    0.1::factB.
    0.7::factC.
    
  
    %hop2
    conclusion:-or(factB,factC).
  
    query(conclusion).
    
hypothesis_assertion: 'Lily is gray' or 'John dropped the apple' or both.