It is probable that Brian is a swan. It is improbable that Lily is a frog. It is impossible that John moved to the office. It is highly likely that if 'Lily is a frog' or 'Brian is a swan' or both then Emily is a wolf. It is unlikely that if 'Brian is a swan and Lily is a frog' then Julius is yellow. It is probable that if either 'Brian is a swan' or 'John moved to the office' but not both then Mary dropped the milk.
It is almost certain that either 'Emily is a wolf' or 'Mary dropped the milk' but not both.
It is probably not the case that either 'Emily is a wolf' or 'Mary dropped the milk' but not both.
It is almost certain that either 'Emily is a wolf' or 'Mary dropped the milk' 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
  0.7::factA.
  0.1::factB.
  0.0::factC.
  %hop1
  0.9::factX:-or(factB,factA).
  0.2::factY:-and(factA,factB).
  0.7::factZ:-xor(factA,factC).

  %hop2
  conclusion:-xor(factX,factZ).

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