context: It is probably not the case that Yann is bored. There is a better than even chance that Fred is in the school. It is probably not the case that Brian is white.
hypothesis: It is almost certain that 'Fred is in the school and Brian is white'.
valid_hypothesis: It is improbable that 'Fred is in the school and Brian is white'.
invalid_hypothesis: It is almost certain that 'Fred is in the school and Brian is white'.
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
    0.25::factA.
    0.6::factB.
    0.25::factC.
    
  
    %hop2
    conclusion:-and(factB,factC).
  
    query(conclusion).
    
hypothesis_assertion: 'Fred is in the school and Brian is white'.