context: There is a better than even chance that Fred dropped the milk. It is unlikely that Mary left the football. It is unlikely that Brian is white.
hypothesis: It is probably not the case that 'Mary left the football' or 'Brian is white' or both.
valid_hypothesis: It is probably not the case that 'Mary left the football' or 'Brian is white' or both.
invalid_hypothesis: It is likely that 'Mary left the football' or 'Brian is white' 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.
    0.2::factB.
    0.2::factC.
    
  
    %hop2
    conclusion:-or(factB,factC).
  
    query(conclusion).
    
hypothesis_assertion: 'Mary left the football' or 'Brian is white' or both.