There is a better than even chance that Lily is a lion. It is impossible that Brian is a swan. There is a very good chance that Greg is a frog. It is unlikely that if 'Greg is a frog and Brian is a swan' then Bernhard is yellow. It is highly unlikely that if either 'Greg is a frog' or 'Brian is a swan' but not both then Julius is gray. Chances are about even that if 'Greg is a frog' or 'Lily is a lion' or both then Bill went to the kitchen.
Chances are slight that 'Julius is gray' or 'Lily is a lion' or both.
There is a better than even chance that 'Julius is gray' or 'Lily is a lion' or both.
Chances are slight that 'Julius is gray' or 'Lily 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
  0.6::factA.
  0.0::factB.
  0.8::factC.
  %hop1
  0.2::factX:-and(factC,factB).
  0.05::factY:-xor(factC,factB).
  0.5::factZ:-or(factC,factA).

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

  query(conclusion).
  
'Julius is gray' or 'Lily is a lion' or both.