It is likely that Bernhard is a swan. It is highly likely that Julius is green. We doubt that Lily is a rhino. It is probable that if either 'Lily is a rhino' or 'Julius is green' but not both then Brian is yellow. It is likely that if either 'Lily is a rhino' or 'Julius is green' but not both then John moved to the garden. It is highly unlikely that if 'Lily is a rhino' or 'Julius is green' or both then Sandra left the milk.
Chances are slight that 'Julius is green and Bernhard is a swan'.
There is a better than even chance that 'Julius is green and Bernhard is a swan'.
Chances are slight that 'Julius is green and Bernhard is a swan'.

  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
  0.7::factA.
  0.9::factB.
  0.2::factC.
  %hop1
  0.7::factX:-xor(factC,factB).
  0.7::factY:-xor(factC,factB).
  0.05::factZ:-or(factC,factB).

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

  query(conclusion).
  
'Julius is green and Bernhard is a swan'.