context: There is a better than even chance that Bernhard is a lion. It is impossible that Mary went to the kitchen. It is almost certain that Lily is a swan.
hypothesis: We believe that 'Mary went to the kitchen and Lily is a swan'.
valid_hypothesis: It is impossible that 'Mary went to the kitchen and Lily is a swan'.
invalid_hypothesis: We believe that 'Mary went to the kitchen and Lily is a swan'.
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
    0.6::factA.
    0.0::factB.
    0.95::factC.
    
  
    %hop2
    conclusion:-and(factB,factC).
  
    query(conclusion).
    
hypothesis_assertion: 'Mary went to the kitchen and Lily is a swan'.