It is certain that Julius is white. It is almost certain that Bernhard is a lion. Chances are slight that Sandra got the football. There is a better than even chance that if 'Sandra got the football' or 'Bernhard is a lion' or both then Greg is a rhino. There is a very good chance that if 'Bernhard is a lion' or 'Sandra got the football' or both then Lily is a frog. It is certain that if 'Bernhard is a lion' or 'Julius is white' or both then Brian is green.
It is likely that either 'Sandra got the football' or 'Lily is a frog' but not both.
It is likely that either 'Sandra got the football' or 'Lily is a frog' but not both.
It is probably not the case that either 'Sandra got the football' or 'Lily 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
  1.0::factA.
  0.95::factB.
  0.1::factC.
  %hop1
  0.6::factX:-or(factC,factB).
  0.8::factY:-or(factB,factC).
  1.0::factZ:-or(factB,factA).

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

  query(conclusion).
  
Either 'Sandra got the football' or 'Lily is a frog' but not both.