It is unlikely that Winona is a mouse. It is probably not the case that Jeff moved to the garden. It is probably the case that Bernhard is gray. There is a very good chance that if 'Jeff moved to the garden' or 'Winona is a mouse' or both then John left the milk. Chances are slight that if 'Winona is a mouse' or 'Jeff moved to the garden' or both then Emily is a sheep. It is likely that if 'Winona is a mouse' or 'Bernhard is gray' or both then Mary put down the apple.
It is probable that either 'Jeff moved to the garden' or 'Emily is a sheep' but not both.
It is probably not the case that either 'Jeff moved to the garden' or 'Emily is a sheep' but not both.
It is probable that either 'Jeff moved to the garden' or 'Emily is a sheep' 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
  0.2::factA.
  0.25::factB.
  0.7::factC.
  %hop1
  0.8::factX:-or(factB,factA).
  0.1::factY:-or(factA,factB).
  0.7::factZ:-or(factA,factC).

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

  query(conclusion).
  
Either 'Jeff moved to the garden' or 'Emily is a sheep' but not both.