context: It is highly likely that Julius is gray. It is probable that John dropped the apple. It is highly unlikely that Jessica is a mouse.
hypothesis: There is little chance that 'John dropped the apple' or 'Jessica is a mouse' or both.
valid_hypothesis: It is probable that 'John dropped the apple' or 'Jessica is a mouse' or both.
invalid_hypothesis: There is little chance that 'John dropped the apple' or 'Jessica is a mouse' 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
    0.9::factA.
    0.7::factB.
    0.05::factC.
    
  
    %hop2
    conclusion:-or(factB,factC).
  
    query(conclusion).
    
hypothesis_assertion: 'John dropped the apple' or 'Jessica is a mouse' or both.