It is unlikely that Julius is gray. It is probably not the case that Daniel got the milk. There is a better than even chance that Bernhard is a frog. It is almost certain that if either 'Bernhard is a frog' or 'Julius is gray' but not both then John moved to the office. We believe that if 'Bernhard is a frog' or 'Daniel got the milk' or both then Greg is a swan. It is highly likely that if 'Daniel got the milk and Bernhard is a frog' then Mary left the football.
It is almost certain that 'Greg is a swan and Bernhard is a frog'.
Chances are about even that 'Greg is a swan and Bernhard is a frog'.
It is almost certain that 'Greg is a swan and Bernhard is a frog'.

  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.
  0.25::factB.
  0.6::factC.
  %hop1
  0.95::factX:-xor(factC,factA).
  0.75::factY:-or(factC,factB).
  0.9::factZ:-and(factB,factC).

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

  query(conclusion).
  
'Greg is a swan and Bernhard is a frog'.