context: It is improbable that Greg is white. It is probably not the case that Emily is a mouse. Chances are about even that John put down the milk.
hypothesis: It is probably not the case that 'Greg is white' or 'Emily is a mouse' or both.
valid_hypothesis: It is probably not the case that 'Greg is white' or 'Emily is a mouse' or both.
invalid_hypothesis: It is almost certain that 'Greg is white' or 'Emily 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
    0.1::factA.
    0.25::factB.
    0.5::factC.
    
  
    %hop2
    conclusion:-or(factA,factB).
  
    query(conclusion).
    
hypothesis_assertion: 'Greg is white' or 'Emily is a mouse' or both.