context: It is unlikely that Fred left the apple. It is probable that Bernhard is white. There is little chance that Brian is green.
hypothesis: It is highly unlikely that 'Brian is green and Bernhard is white'.
valid_hypothesis: It is highly unlikely that 'Brian is green and Bernhard is white'.
invalid_hypothesis: It is likely that 'Brian is green and Bernhard 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
    0.2::factA.
    0.7::factB.
    0.1::factC.
    
  
    %hop2
    conclusion:-and(factC,factB).
  
    query(conclusion).
    
hypothesis_assertion: 'Brian is green and Bernhard is white'.