It is impossible that Daniel took the milk. We believe that John put down the apple. There is a better than even chance that Mary went to the office. It is impossible that if 'John put down the apple and Mary went to the office' then Julius is gray. There is a better than even chance that if either 'Mary went to the office' or 'Daniel took the milk' but not both then Bernhard is a swan. We believe that if 'Mary went to the office and John put down the apple' then Antoine is thirsty.
Chances are about even that 'Bernhard is a swan and Daniel took the milk'.
It is impossible that 'Bernhard is a swan and Daniel took the milk'.
Chances are about even that 'Bernhard is a swan and Daniel took the milk'.

  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
  0.0::factA.
  0.75::factB.
  0.6::factC.
  %hop1
  0.0::factX:-and(factB,factC).
  0.6::factY:-xor(factC,factA).
  0.75::factZ:-and(factC,factB).

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

  query(conclusion).
  
'Bernhard is a swan and Daniel took the milk'.