It is probably not the case that Julius is a rhino. There is a better than even chance that Mary dropped the milk. Chances are slight that Daniel took the apple. There is little chance that if 'Julius is a rhino and Mary dropped the milk' then Fred went to the garden. There is a better than even chance that if 'Mary dropped the milk' or 'Julius is a rhino' or both then Lily is a lion. It is highly unlikely that if 'Mary dropped the milk' or 'Julius is a rhino' or both then Bernhard is green.
There is almost no chance that 'Lily is a lion' or 'Fred went to the garden' or both.
Chances are about even that 'Lily is a lion' or 'Fred went to the garden' or both.
There is almost no chance that 'Lily is a lion' or 'Fred went to the garden' 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
  0.25::factA.
  0.6::factB.
  0.1::factC.
  %hop1
  0.1::factX:-and(factA,factB).
  0.6::factY:-or(factB,factA).
  0.05::factZ:-or(factB,factA).

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

  query(conclusion).
  
'Lily is a lion' or 'Fred went to the garden' or both.