Chances are about even that Emily is a mouse. There is a very good chance that Jessica is a cat. It is unlikely that Brian is yellow. It is probable that if 'Jessica is a cat and Brian is yellow' then Lily is a rhino. It is probable that if 'Emily is a mouse and Jessica is a cat' then Sandra left the apple. Chances are slight that if 'Jessica is a cat' or 'Brian is yellow' or both then Bernhard is a rhino.
It is probably not the case that either 'Sandra left the apple' or 'Lily is a rhino' but not both.
It is probably not the case that either 'Sandra left the apple' or 'Lily is a rhino' but not both.
There is a very good chance that either 'Sandra left the apple' 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
  0.5::factA.
  0.8::factB.
  0.2::factC.
  %hop1
  0.7::factX:-and(factB,factC).
  0.7::factY:-and(factA,factB).
  0.1::factZ:-or(factB,factC).

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

  query(conclusion).
  
Either 'Sandra left the apple' or 'Lily is a rhino' but not both.