context: It is certain that John moved to the office. It is highly unlikely that Greg is yellow. It is probable that Brian is white.
hypothesis: It is highly unlikely that 'Brian is white and Greg is yellow'.
valid_hypothesis: It is highly unlikely that 'Brian is white and Greg is yellow'.
invalid_hypothesis: It is probably the case that 'Brian is white and Greg is yellow'.
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
    1.0::factA.
    0.05::factB.
    0.7::factC.
    
  
    %hop2
    conclusion:-and(factC,factB).
  
    query(conclusion).
    
hypothesis_assertion: 'Brian is white and Greg is yellow'.