context: It is improbable that Bill moved to the office. It is probable that Lily is gray. It is certain that Brian is yellow.
hypothesis: It is certain that 'Brian is yellow' or 'Lily is gray' or both.
valid_hypothesis: It is certain that 'Brian is yellow' or 'Lily is gray' or both.
invalid_hypothesis: Chances are slight that 'Brian is yellow' or 'Lily is gray' 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.
    0.7::factB.
    1.0::factC.
    
  
    %hop2
    conclusion:-or(factC,factB).
  
    query(conclusion).
    
hypothesis_assertion: 'Brian is yellow' or 'Lily is gray' or both.