Chances are slight that Brian is a swan. It is almost certain that Emily is a wolf. It is probably the case that John moved to the garden. It is almost certain that if either 'John moved to the garden' or 'Brian is a swan' but not both then Greg is green. It is improbable that if either 'Brian is a swan' or 'John moved to the garden' but not both then Mary left the football. There is a better than even chance that if 'Emily is a wolf and John moved to the garden' then Sandra got the football.
It is highly likely that either 'Emily is a wolf' or 'Mary left the football' but not both.
It is highly likely that either 'Emily is a wolf' or 'Mary left the football' but not both.
It is probably not the case that either 'Emily is a wolf' or 'Mary left the football' 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.
  0.95::factB.
  0.7::factC.
  %hop1
  0.95::factX:-xor(factC,factA).
  0.1::factY:-xor(factA,factC).
  0.6::factZ:-and(factB,factC).

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

  query(conclusion).
  
Either 'Emily is a wolf' or 'Mary left the football' but not both.