Chances are about even that Bernhard is a frog. It is impossible that Jessica is a mouse. Chances are slight that Julius is a rhino. It is probably the case that if 'Jessica is a mouse' or 'Bernhard is a frog' or both then Lily is a swan. Chances are about even that if 'Bernhard is a frog and Jessica is a mouse' then Daniel got the apple. It is probably not the case that if 'Bernhard is a frog' or 'Julius is a rhino' or both then John moved to the garden.
It is probable that either 'Julius is a rhino' or 'John moved to the garden' but not both.
It is unlikely that either 'Julius is a rhino' or 'John moved to the garden' but not both.
It is probable that either 'Julius is a rhino' or 'John moved to the garden' 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
  0.5::factA.
  0.0::factB.
  0.1::factC.
  %hop1
  0.7::factX:-or(factB,factA).
  0.5::factY:-and(factA,factB).
  0.25::factZ:-or(factA,factC).

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

  query(conclusion).
  
Either 'Julius is a rhino' or 'John moved to the garden' but not both.