context: It is unlikely that Julius is gray. It is highly likely that Lily is yellow. It is probable that John took the football.
hypothesis: It is certain that 'Julius is gray and John took the football'.
valid_hypothesis: It is improbable that 'Julius is gray and John took the football'.
invalid_hypothesis: It is certain that 'Julius is gray and John took the football'.
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.
    0.9::factB.
    0.7::factC.
    
  
    %hop2
    conclusion:-and(factA,factC).
  
    query(conclusion).
    
hypothesis_assertion: 'Julius is gray and John took the football'.