context: It is probably not the case that Bernhard is a rhino. It is unlikely that John got the apple. It is unlikely that Jeff went to the hallway.
hypothesis: It is certain that 'Bernhard is a rhino and Jeff went to the hallway'.
valid_hypothesis: It is highly unlikely that 'Bernhard is a rhino and Jeff went to the hallway'.
invalid_hypothesis: It is certain that 'Bernhard is a rhino and Jeff went to the hallway'.
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
    0.25::factA.
    0.2::factB.
    0.2::factC.
    
  
    %hop2
    conclusion:-and(factA,factC).
  
    query(conclusion).
    
hypothesis_assertion: 'Bernhard is a rhino and Jeff went to the hallway'.