context: It is unlikely that Brian is white. We doubt that Jeff moved to the garden. It is likely that Greg is gray.
hypothesis: Chances are slight that 'Jeff moved to the garden and Greg is gray'.
valid_hypothesis: Chances are slight that 'Jeff moved to the garden and Greg is gray'.
invalid_hypothesis: It is probably the case that 'Jeff moved to the garden and Greg is gray'.
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
    0.2::factA.
    0.2::factB.
    0.7::factC.
    
  
    %hop2
    conclusion:-and(factB,factC).
  
    query(conclusion).
    
hypothesis_assertion: 'Jeff moved to the garden and Greg is gray'.