It is impossible that Greg is a swan. It is probably not the case that Bernhard is a rhino. There is a better than even chance that Sandra got the football. It is probably the case that if either 'Bernhard is a rhino' or 'Greg is a swan' but not both then John went to the office. It is probably the case that if either 'Bernhard is a rhino' or 'Greg is a swan' but not both then Jason is bored. There is a very good chance that if either 'Sandra got the football' or 'Greg is a swan' but not both then Brian is gray.
It is highly unlikely that either 'Bernhard is a rhino' or 'John went to the office' but not both.
It is highly unlikely that either 'Bernhard is a rhino' or 'John went to the office' but not both.
It is almost certain that either 'Bernhard is a rhino' or 'John went to the office' 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
  0.0::factA.
  0.25::factB.
  0.6::factC.
  %hop1
  0.7::factX:-xor(factB,factA).
  0.7::factY:-xor(factB,factA).
  0.8::factZ:-xor(factC,factA).

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

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