It is almost certain that Greg is a swan. It is probable that Mary put down the milk. There is little chance that Julius is a lion. It is likely that if either 'Julius is a lion' or 'Greg is a swan' but not both then Daniel got the football. There is little chance that if 'Julius is a lion and Greg is a swan' then John grabbed the apple. It is highly unlikely that if 'Julius is a lion' or 'Greg is a swan' or both then Bernhard is a frog.
It is probably the case that 'Julius is a lion' or 'John grabbed the apple' or both.
Chances are slight that 'Julius is a lion' or 'John grabbed the apple' or both.
It is probably the case that 'Julius is a lion' or 'John grabbed 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
  0.95::factA.
  0.7::factB.
  0.1::factC.
  %hop1
  0.7::factX:-xor(factC,factA).
  0.1::factY:-and(factC,factA).
  0.05::factZ:-or(factC,factA).

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

  query(conclusion).
  
'Julius is a lion' or 'John grabbed the apple' or both.