We doubt that Brian is white. It is improbable that Lily is a rhino. It is probably the case that Mary went to the bedroom. It is probably the case that if 'Lily is a rhino' or 'Brian is white' or both then Daniel dropped the apple. There is a very good chance that if 'Lily is a rhino and Brian is white' then John moved to the garden. There is a better than even chance that if either 'Lily is a rhino' or 'Mary went to the bedroom' but not both then Bernhard is yellow.
It is highly likely that either 'Brian is white' or 'Lily is a rhino' but not both.
It is probably not the case that either 'Brian is white' or 'Lily is a rhino' but not both.
It is highly likely that either 'Brian is white' 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
  0.2::factA.
  0.1::factB.
  0.7::factC.
  %hop1
  0.7::factX:-or(factB,factA).
  0.8::factY:-and(factB,factA).
  0.6::factZ:-xor(factB,factC).

  %hop2
  conclusion:-xor(factA,factB).

  query(conclusion).
  
Either 'Brian is white' or 'Lily is a rhino' but not both.