context: It is highly unlikely that Lily is a swan. It is almost certain that Brian is a frog. It is impossible that Mary went to the hallway.
hypothesis: It is impossible that 'Lily is a swan and Mary went to the hallway'.
valid_hypothesis: It is impossible that 'Lily is a swan and Mary went to the hallway'.
invalid_hypothesis: We believe that 'Lily is a swan and Mary 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
    0.05::factA.
    0.95::factB.
    0.0::factC.
    
  
    %hop2
    conclusion:-and(factA,factC).
  
    query(conclusion).
    
hypothesis_assertion: 'Lily is a swan and Mary went to the hallway'.