There is almost no chance that Emily is a sheep. It is probably not the case that Bernhard is a rhino. We believe that Mary took the football. There is a better than even chance that if either 'Bernhard is a rhino' or 'Emily is a sheep' but not both then Bill went to the garden. There is a very good chance that if 'Emily is a sheep and Bernhard is a rhino' then Sandra dropped the milk. There is a very good chance that if 'Bernhard is a rhino' or 'Mary took the football' or both then John discarded the milk.
It is highly likely that either 'Bill went to the garden' or 'Emily is a sheep' but not both.
We doubt that either 'Bill went to the garden' or 'Emily is a sheep' but not both.
It is highly likely that either 'Bill went to the garden' or 'Emily is a sheep' 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
  0.02::factA.
  0.25::factB.
  0.75::factC.
  %hop1
  0.6::factX:-xor(factB,factA).
  0.8::factY:-and(factA,factB).
  0.8::factZ:-or(factB,factC).

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

  query(conclusion).
  
Either 'Bill went to the garden' or 'Emily is a sheep' but not both.