There is a better than even chance that Brian is a rhino. It is probable that John got the apple. It is highly unlikely that Sandra took the milk. It is highly unlikely that if either 'Sandra took the milk' or 'Brian is a rhino' but not both then Yann is bored. It is improbable that if 'John got the apple and Sandra took the milk' then Mary went to the hallway. There is a better than even chance that if 'Sandra took the milk' or 'Brian is a rhino' or both then Lily is green.
It is probably not the case that either 'Lily is green' or 'Brian is a rhino' but not both.
It is probably not the case that either 'Lily is green' or 'Brian is a rhino' but not both.
We believe that either 'Lily is green' or 'Brian is a rhino' 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
  0.6::factA.
  0.7::factB.
  0.05::factC.
  %hop1
  0.05::factX:-xor(factC,factA).
  0.1::factY:-and(factB,factC).
  0.6::factZ:-or(factC,factA).

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

  query(conclusion).
  
Either 'Lily is green' or 'Brian is a rhino' but not both.