context: It is certain that Lily is a rhino. It is highly likely that Bernhard is a rhino. There is a very good chance that Julius is a frog.
hypothesis: It is probably not the case that 'Bernhard is a rhino and Julius is a frog'.
valid_hypothesis: It is likely that 'Bernhard is a rhino and Julius is a frog'.
invalid_hypothesis: It is probably not the case that 'Bernhard is a rhino and Julius 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
    1.0::factA.
    0.9::factB.
    0.8::factC.
    
  
    %hop2
    conclusion:-and(factB,factC).
  
    query(conclusion).
    
hypothesis_assertion: 'Bernhard is a rhino and Julius is a frog'.