It is probably not the case that Brian is a rhino. Chances are slight that Winona is a mouse. It is improbable that Sandra left the football. It is unlikely that if 'Brian is a rhino' or 'Winona is a mouse' or both then Lily is a swan. We doubt that if either 'Brian is a rhino' or 'Sandra left the football' but not both then Julius is a frog. It is probably the case that if 'Winona is a mouse and Brian is a rhino' then Daniel got the apple.
There is a very good chance that 'Lily is a swan' or 'Daniel got the apple' or both.
There is little chance that 'Lily is a swan' or 'Daniel got the apple' or both.
There is a very good chance that 'Lily is a swan' or 'Daniel got 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
  0.25::factA.
  0.1::factB.
  0.1::factC.
  %hop1
  0.2::factX:-or(factA,factB).
  0.2::factY:-xor(factA,factC).
  0.7::factZ:-and(factB,factA).

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

  query(conclusion).
  
'Lily is a swan' or 'Daniel got the apple' or both.