context: It is probably not the case that Julius is yellow. It is improbable that Sandra left the milk. Chances are slight that Jessica is a cat. It is highly unlikely that if either 'Jessica is a cat' or 'Sandra left the milk' but not both then Brian is green. There is a better than even chance that if 'Sandra left the milk' or 'Jessica is a cat' or both then Fred went to the office. It is almost certain that if either 'Jessica is a cat' or 'Sandra left the milk' but not both then Lily is a rhino.
hypothesis: It is improbable that 'Lily is a rhino and Jessica is a cat'.
valid_hypothesis: It is improbable that 'Lily is a rhino and Jessica is a cat'.
invalid_hypothesis: It is highly likely that 'Lily is a rhino and Jessica is a cat'.
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.
    0.1::factB.
    0.1::factC.
    %hop1
    0.05::factX:-xor(factC,factB).
    0.6::factY:-or(factB,factC).
    0.95::factZ:-xor(factC,factB).
  
    %hop2
    conclusion:-and(factZ,factC).
  
    query(conclusion).
    
hypothesis_assertion: 'Lily is a rhino and Jessica is a cat'.