context: It is likely that Jason is tired. There is almost no chance that John got the football. There is little chance that Julius is yellow.
hypothesis: It is impossible that 'Julius is yellow and John got the football'.
valid_hypothesis: It is impossible that 'Julius is yellow and John got the football'.
invalid_hypothesis: It is certain that 'Julius is yellow and John got 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
    0.7::factA.
    0.02::factB.
    0.1::factC.
    
  
    %hop2
    conclusion:-and(factC,factB).
  
    query(conclusion).
    
hypothesis_assertion: 'Julius is yellow and John got the football'.