It is probably not the case that Brian is white. It is probably not the case that Mary went to the bedroom. We doubt that Lily is a rhino. It is probable that if 'Mary went to the bedroom' or 'Lily is a rhino' or both then Julius is a frog. There is little chance that if either 'Lily is a rhino' or 'Brian is white' but not both then Jessica is a mouse. It is probable that if either 'Lily is a rhino' or 'Mary went to the bedroom' but not both then Bernhard is gray.
It is probably not the case that either 'Lily is a rhino' or 'Mary went to the bedroom' but not both.
It is probably not the case that either 'Lily is a rhino' or 'Mary went to the bedroom' but not both.
It is probably the case that either 'Lily is a rhino' or 'Mary went to the bedroom' 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
  0.25::factA.
  0.25::factB.
  0.2::factC.
  %hop1
  0.7::factX:-or(factB,factC).
  0.1::factY:-xor(factC,factA).
  0.7::factZ:-xor(factC,factB).

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

  query(conclusion).
  
Either 'Lily is a rhino' or 'Mary went to the bedroom' but not both.