It is highly unlikely that Lily is a rhino. It is highly likely that Sandra grabbed the apple. We doubt that Bernhard is yellow. There is a better than even chance that if 'Sandra grabbed the apple and Bernhard is yellow' then Julius is a lion. There is almost no chance that if either 'Bernhard is yellow' or 'Lily is a rhino' but not both then Brian is green. There is a very good chance that if 'Sandra grabbed the apple' or 'Bernhard is yellow' or both then Mary left the milk.
It is unlikely that 'Julius is a lion' or 'Bernhard is yellow' or both.
It is unlikely that 'Julius is a lion' or 'Bernhard is yellow' or both.
It is likely that 'Julius is a lion' or 'Bernhard is yellow' 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
  0.05::factA.
  0.9::factB.
  0.2::factC.
  %hop1
  0.6::factX:-and(factB,factC).
  0.02::factY:-xor(factC,factA).
  0.8::factZ:-or(factB,factC).

  %hop2
  conclusion:-or(factX,factC).

  query(conclusion).
  
'Julius is a lion' or 'Bernhard is yellow' or both.