It is certain that Greg is yellow. It is improbable that Julius is a rhino. It is certain that Daniel got the milk. There is little chance that if either 'Daniel got the milk' or 'Greg is yellow' but not both then Bernhard is a swan. It is almost certain that if 'Greg is yellow' or 'Daniel got the milk' or both then John dropped the apple. There is almost no chance that if either 'Julius is a rhino' or 'Greg is yellow' but not both then Lily is a lion.
It is almost certain that 'John dropped the apple' or 'Julius is a rhino' or both.
It is almost certain that 'John dropped the apple' or 'Julius is a rhino' or both.
It is unlikely that 'John dropped the apple' or 'Julius is a rhino' 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
  1.0::factA.
  0.1::factB.
  1.0::factC.
  %hop1
  0.1::factX:-xor(factC,factA).
  0.95::factY:-or(factA,factC).
  0.02::factZ:-xor(factB,factA).

  %hop2
  conclusion:-or(factY,factB).

  query(conclusion).
  
'John dropped the apple' or 'Julius is a rhino' or both.