There is a better than even chance that Gertrude is a cat. It is highly likely that Bernhard is white. It is probably not the case that Emily is a sheep. It is probably the case that if 'Emily is a sheep' or 'Bernhard is white' or both then Brian is a rhino. It is probably not the case that if either 'Emily is a sheep' or 'Bernhard is white' but not both then Julius is a frog. It is probable that if either 'Emily is a sheep' or 'Gertrude is a cat' but not both then John picked up the apple.
There is a better than even chance that either 'Emily is a sheep' or 'Gertrude is a cat' but not both.
There is a better than even chance that either 'Emily is a sheep' or 'Gertrude is a cat' but not both.
It is highly unlikely that either 'Emily is a sheep' or 'Gertrude is a cat' 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
  0.6::factA.
  0.9::factB.
  0.25::factC.
  %hop1
  0.7::factX:-or(factC,factB).
  0.25::factY:-xor(factC,factB).
  0.7::factZ:-xor(factC,factA).

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

  query(conclusion).
  
Either 'Emily is a sheep' or 'Gertrude is a cat' but not both.