context: It is unlikely that Brian is green. There is almost no chance that Sandra got the football. It is unlikely that Fred left the apple.
hypothesis: It is impossible that 'Sandra got the football and Fred left the apple'.
valid_hypothesis: It is impossible that 'Sandra got the football and Fred left the apple'.
invalid_hypothesis: It is almost certain that 'Sandra got the football and Fred left the apple'.
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.
    0.02::factB.
    0.2::factC.
    
  
    %hop2
    conclusion:-and(factB,factC).
  
    query(conclusion).
    
hypothesis_assertion: 'Sandra got the football and Fred left the apple'.