It is likely that Bernhard is a lion. It is probably the case that Sandra left the milk. It is almost certain that John picked up the apple. It is likely that if either 'Bernhard is a lion' or 'John picked up the apple' but not both then Fred went to the garden. It is improbable that if 'Sandra left the milk' or 'Bernhard is a lion' or both then Mary got the football. It is certain that if 'Bernhard is a lion' or 'Sandra left the milk' or both then Lily is a swan.
It is almost certain that 'Lily is a swan' or 'Fred went to the garden' or both.
It is almost certain that 'Lily is a swan' or 'Fred went to the garden' or both.
It is probably not the case that 'Lily is a swan' 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
  0.7::factA.
  0.7::factB.
  0.95::factC.
  %hop1
  0.7::factX:-xor(factA,factC).
  0.1::factY:-or(factB,factA).
  1.0::factZ:-or(factA,factB).

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

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