We doubt that Julius is a swan. It is highly unlikely that Greg is yellow. It is probably not the case that Bernhard is a lion. It is unlikely that if either 'Julius is a swan' or 'Bernhard is a lion' but not both then John went to the hallway. It is highly unlikely that if 'Julius is a swan and Bernhard is a lion' then Mary moved to the office. It is probable that if 'Bernhard is a lion' or 'Greg is yellow' or both then Jessica is a cat.
It is probably not the case that 'Bernhard is a lion' or 'Jessica is a cat' or both.
It is probably not the case that 'Bernhard is a lion' or 'Jessica is a cat' or both.
It is almost certain that 'Bernhard is a lion' or 'Jessica is a cat' 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
  0.2::factA.
  0.05::factB.
  0.25::factC.
  %hop1
  0.2::factX:-xor(factA,factC).
  0.05::factY:-and(factA,factC).
  0.7::factZ:-or(factC,factB).

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

  query(conclusion).
  
'Bernhard is a lion' or 'Jessica is a cat' or both.