context: There is a very good chance that Sandra dropped the milk. It is improbable that Brian is green. Chances are slight that Bernhard is a frog.
hypothesis: It is likely that 'Sandra dropped the milk and Bernhard is a frog'.
valid_hypothesis: Chances are slight that 'Sandra dropped the milk and Bernhard is a frog'.
invalid_hypothesis: It is likely that 'Sandra dropped the milk and Bernhard is a frog'.
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
    0.8::factA.
    0.1::factB.
    0.1::factC.
    
  
    %hop2
    conclusion:-and(factA,factC).
  
    query(conclusion).
    
hypothesis_assertion: 'Sandra dropped the milk and Bernhard is a frog'.