There is almost no chance that Julius is a frog. We believe that John took the apple. It is probable that Bernhard is a rhino. It is probably not the case that if either 'Bernhard is a rhino' or 'John took the apple' but not both then Greg is a swan. It is improbable that if either 'Julius is a frog' or 'Bernhard is a rhino' but not both then Daniel got the milk. We believe that if either 'Julius is a frog' or 'John took the apple' but not both then Brian is a swan.
It is almost certain that 'John took the apple' or 'Bernhard is a rhino' or both.
It is almost certain that 'John took the apple' or 'Bernhard is a rhino' or both.
We doubt that 'John took the apple' or 'Bernhard is a rhino' or 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.
  0.75::factB.
  0.7::factC.
  %hop1
  0.25::factX:-xor(factC,factB).
  0.1::factY:-xor(factA,factC).
  0.75::factZ:-xor(factA,factB).

  %hop2
  conclusion:-or(factB,factC).

  query(conclusion).
  
'John took the apple' or 'Bernhard is a rhino' or both.