It is certain that Daniel took the apple. There is little chance that Julius is a lion. It is likely that Mary left the milk. It is highly unlikely that if 'Daniel took the apple and Mary left the milk' then Gertrude is a cat. It is unlikely that if either 'Daniel took the apple' or 'Julius is a lion' but not both then Brian is yellow. We believe that if either 'Julius is a lion' or 'Mary left the milk' but not both then Greg is white.
Chances are about even that 'Julius is a lion' or 'Daniel took the apple' or both.
It is certain that 'Julius is a lion' or 'Daniel took the apple' or both.
Chances are about even that 'Julius is a lion' or 'Daniel took the apple' 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.
  0.7::factC.
  %hop1
  0.05::factX:-and(factA,factC).
  0.2::factY:-xor(factA,factB).
  0.75::factZ:-xor(factB,factC).

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

  query(conclusion).
  
'Julius is a lion' or 'Daniel took the apple' or both.