It is probable that Winona is a mouse. We doubt that Brian is a rhino. It is impossible that John took the milk. Chances are about even that if 'Brian is a rhino and Winona is a mouse' then Julius is white. There is almost no chance that if 'Brian is a rhino' or 'Winona is a mouse' or both then Jason is tired. Chances are slight that if either 'Brian is a rhino' or 'John took the milk' but not both then Lily is a rhino.
It is likely that either 'Lily is a rhino' or 'Winona is a mouse' but not both.
It is likely that either 'Lily is a rhino' or 'Winona is a mouse' but not both.
There is almost no chance that either 'Lily is a rhino' or 'Winona is a mouse' 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.
  0.2::factB.
  0.0::factC.
  %hop1
  0.5::factX:-and(factB,factA).
  0.02::factY:-or(factB,factA).
  0.1::factZ:-xor(factB,factC).

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

  query(conclusion).
  
Either 'Lily is a rhino' or 'Winona is a mouse' but not both.