It is almost certain that Brian is a rhino. It is probable that Jason is tired. It is almost certain that Bernhard is a swan. It is certain that if 'Bernhard is a swan and Brian is a rhino' then Mary went to the garden. It is likely that if 'Bernhard is a swan and Brian is a rhino' then Greg is a swan. There is little chance that if either 'Brian is a rhino' or 'Jason is tired' but not both then Lily is a lion.
It is probably not the case that either 'Jason is tired' or 'Brian is a rhino' but not both.
It is probably not the case that either 'Jason is tired' or 'Brian is a rhino' but not both.
It is almost certain that either 'Jason is tired' 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
  0.95::factA.
  0.7::factB.
  0.95::factC.
  %hop1
  1.0::factX:-and(factC,factA).
  0.7::factY:-and(factC,factA).
  0.1::factZ:-xor(factA,factB).

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

  query(conclusion).
  
Either 'Jason is tired' or 'Brian is a rhino' but not both.