It is highly likely that Julius is a lion. We doubt that John put down the apple. It is improbable that Jessica is a cat. We doubt that if either 'Julius is a lion' or 'Jessica is a cat' but not both then Lily is white. It is highly unlikely that if 'Jessica is a cat' or 'Julius is a lion' or both then Mary went to the office. It is impossible that if 'Julius is a lion' or 'Jessica is a cat' or both then Bernhard is yellow.
There is little chance that 'Julius is a lion' or 'Lily is white' or both.
It is highly likely that 'Julius is a lion' or 'Lily is white' or both.
There is little chance that 'Julius is a lion' or 'Lily is white' 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
  0.9::factA.
  0.2::factB.
  0.1::factC.
  %hop1
  0.2::factX:-xor(factA,factC).
  0.05::factY:-or(factC,factA).
  0.0::factZ:-or(factA,factC).

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

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