There is a very good chance that Greg is a lion. It is likely that Lily is a rhino. There is almost no chance that Julius is a swan. It is impossible that if 'Julius is a swan' or 'Lily is a rhino' or both then Bernhard is yellow. There is almost no chance that if either 'Greg is a lion' or 'Lily is a rhino' but not both then Sandra put down the milk. It is certain that if either 'Julius is a swan' or 'Lily is a rhino' but not both then Brian is green.
It is impossible that 'Lily is a rhino' or 'Greg is a lion' or both.
It is almost certain that 'Lily is a rhino' or 'Greg is a lion' or both.
It is impossible that 'Lily is a rhino' or 'Greg is a lion' 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
  0.8::factA.
  0.7::factB.
  0.02::factC.
  %hop1
  0.0::factX:-or(factC,factB).
  0.02::factY:-xor(factA,factB).
  1.0::factZ:-xor(factC,factB).

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

  query(conclusion).
  
'Lily is a rhino' or 'Greg is a lion' or both.