It is almost certain that Bernhard is a frog. It is highly likely that Emily is a wolf. Chances are slight that John went to the hallway. There is a better than even chance that if 'Emily is a wolf' or 'Bernhard is a frog' or both then Sandra took the milk. It is probably not the case that if either 'John went to the hallway' or 'Bernhard is a frog' but not both then Julius is a rhino. Chances are about even that if 'John went to the hallway' or 'Bernhard is a frog' or both then Greg is a frog.
It is highly likely that either 'John went to the hallway' or 'Bernhard is a frog' but not both.
It is highly likely that either 'John went to the hallway' or 'Bernhard is a frog' but not both.
It is unlikely that either 'John went to the hallway' or 'Bernhard is a frog' 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
  0.6::factX:-or(factB,factA).
  0.25::factY:-xor(factC,factA).
  0.5::factZ:-or(factC,factA).

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

  query(conclusion).
  
Either 'John went to the hallway' or 'Bernhard is a frog' but not both.