It is almost certain that Emily is a wolf. It is highly likely that Greg is green. There is little chance that Mary dropped the milk. There is little chance that if 'Greg is green' or 'Emily is a wolf' or both then Bill moved to the office. It is probable that if 'Mary dropped the milk and Emily is a wolf' then John went to the kitchen. There is a better than even chance that if 'Mary dropped the milk and Emily is a wolf' then Julius is white.
It is probably not the case that either 'Emily is a wolf' or 'Bill moved to the office' but not both.
It is highly likely that either 'Emily is a wolf' or 'Bill moved to the office' but not both.
It is probably not the case that either 'Emily is a wolf' or 'Bill moved to the office' 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
  0.95::factA.
  0.9::factB.
  0.1::factC.
  %hop1
  0.1::factX:-or(factB,factA).
  0.7::factY:-and(factC,factA).
  0.6::factZ:-and(factC,factA).

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

  query(conclusion).
  
Either 'Emily is a wolf' or 'Bill moved to the office' but not both.