It is probably not the case that Jessica is a cat. There is a very good chance that Julius is gray. Chances are slight that Bernhard is a swan. It is almost certain that if either 'Jessica is a cat' or 'Bernhard is a swan' but not both then Daniel took the apple. There is a better than even chance that if 'Julius is gray and Bernhard is a swan' then Lily is a lion. There is a very good chance that if either 'Julius is gray' or 'Jessica is a cat' but not both then John went to the hallway.
There is almost no chance that 'Bernhard is a swan and Jessica is a cat'.
There is almost no chance that 'Bernhard is a swan and Jessica is a cat'.
It is probable that 'Bernhard is a swan and Jessica is a cat'.

  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
  0.25::factA.
  0.8::factB.
  0.1::factC.
  %hop1
  0.95::factX:-xor(factA,factC).
  0.6::factY:-and(factB,factC).
  0.8::factZ:-xor(factB,factA).

  %hop2
  conclusion:-and(factC,factA).

  query(conclusion).
  
'Bernhard is a swan and Jessica is a cat'.