It is unlikely that Julius is a lion. We doubt that Bernhard is white. There is a better than even chance that Brian is yellow. It is probable that if 'Bernhard is white' or 'Brian is yellow' or both then Greg is a lion. There is a better than even chance that if 'Brian is yellow' or 'Bernhard is white' or both then Lily is white. We believe that if 'Bernhard is white and Julius is a lion' then Mary left the apple.
Chances are about even that 'Mary left the apple' or 'Greg is a lion' or both.
Chances are about even that 'Mary left the apple' or 'Greg is a lion' or both.
It is highly unlikely that 'Mary left the apple' 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
  0.2::factA.
  0.2::factB.
  0.6::factC.
  %hop1
  0.7::factX:-or(factB,factC).
  0.6::factY:-or(factC,factB).
  0.75::factZ:-and(factB,factA).

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

  query(conclusion).
  
'Mary left the apple' or 'Greg is a lion' or both.