It is impossible that Greg is a swan. It is likely that Bernhard is a rhino. It is unlikely that Sandra grabbed the apple. It is almost certain that if 'Sandra grabbed the apple' or 'Bernhard is a rhino' or both then Julius is a swan. It is unlikely that if either 'Greg is a swan' or 'Sandra grabbed the apple' but not both then Winona is a mouse. It is improbable that if either 'Greg is a swan' or 'Sandra grabbed the apple' but not both then Lily is a rhino.
There is a very good chance that either 'Winona is a mouse' or 'Lily is a rhino' but not both.
It is highly unlikely that either 'Winona is a mouse' or 'Lily is a rhino' but not both.
There is a very good chance that either 'Winona is a mouse' or 'Lily is a rhino' but not both.

  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
  0.0::factA.
  0.7::factB.
  0.2::factC.
  %hop1
  0.95::factX:-or(factC,factB).
  0.2::factY:-xor(factA,factC).
  0.1::factZ:-xor(factA,factC).

  %hop2
  conclusion:-xor(factY,factZ).

  query(conclusion).
  
Either 'Winona is a mouse' or 'Lily is a rhino' but not both.