context: It is certain that Mary is in the school. It is highly unlikely that Bernhard is a rhino. It is certain that Lily is a lion.
hypothesis: It is highly unlikely that either 'Bernhard is a rhino' or 'Lily is a lion' but not both.
valid_hypothesis: It is almost certain that either 'Bernhard is a rhino' or 'Lily is a lion' but not both.
invalid_hypothesis: It is highly unlikely that either 'Bernhard is a rhino' or 'Lily is a lion' but not both.
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.
    0.05::factB.
    1.0::factC.
    
  
    %hop2
    conclusion:-xor(factB,factC).
  
    query(conclusion).
    
hypothesis_assertion: Either 'Bernhard is a rhino' or 'Lily is a lion' but not both.