There is a better than even chance that Mary went to the office. It is almost certain that Lily is a rhino. It is probably not the case that John got the apple. It is highly likely that if 'John got the apple and Lily is a rhino' then Brian is green. It is unlikely that if either 'Lily is a rhino' or 'Mary went to the office' but not both then Julius is a swan. There is a very good chance that if 'Lily is a rhino and Mary went to the office' then Sandra took the milk.
It is probably not the case that either 'John got the apple' or 'Julius is a swan' but not both.
It is probably not the case that either 'John got the apple' or 'Julius is a swan' but not both.
It is probable that either 'John got the apple' or 'Julius is a swan' 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.
  0.95::factB.
  0.25::factC.
  %hop1
  0.9::factX:-and(factC,factB).
  0.2::factY:-xor(factB,factA).
  0.8::factZ:-and(factB,factA).

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

  query(conclusion).
  
Either 'John got the apple' or 'Julius is a swan' but not both.