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