context: It is probably the case that Mary moved to the office. It is almost certain that Greg is a rhino. It is impossible that Julius is white. There is a very good chance that if either 'Greg is a rhino' or 'Julius is white' but not both then Jessica is a mouse. It is unlikely that if 'Julius is white' or 'Greg is a rhino' or both then Daniel left the milk. It is likely that if either 'Julius is white' or 'Greg is a rhino' but not both then Bernhard is a swan.
hypothesis: It is impossible that 'Jessica is a mouse and Bernhard is a swan'.
valid_hypothesis: Chances are about even that 'Jessica is a mouse and Bernhard is a swan'.
invalid_hypothesis: It is impossible that 'Jessica is a mouse and Bernhard 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
    0.7::factA.
    0.95::factB.
    0.0::factC.
    %hop1
    0.8::factX:-xor(factB,factC).
    0.2::factY:-or(factC,factB).
    0.7::factZ:-xor(factC,factB).
  
    %hop2
    conclusion:-and(factX,factZ).
  
    query(conclusion).
    
hypothesis_assertion: 'Jessica is a mouse and Bernhard is a swan'.