It is improbable that Julius is white. It is unlikely that Jessica is a sheep. Chances are slight that Mary went to the kitchen. There is little chance that if 'Jessica is a sheep' or 'Julius is white' or both then Brian is a lion. It is probable that if 'Jessica is a sheep and Mary went to the kitchen' then Daniel got the milk. It is probably the case that if either 'Jessica is a sheep' or 'Julius is white' but not both then Bernhard is a frog.
It is probably not the case that either 'Jessica is a sheep' or 'Julius is white' but not both.
It is probably not the case that either 'Jessica is a sheep' or 'Julius is white' but not both.
It is almost certain that either 'Jessica is a sheep' or 'Julius is white' 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
  0.1::factA.
  0.2::factB.
  0.1::factC.
  %hop1
  0.1::factX:-or(factB,factA).
  0.7::factY:-and(factB,factC).
  0.7::factZ:-xor(factB,factA).

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

  query(conclusion).
  
Either 'Jessica is a sheep' or 'Julius is white' but not both.