It is highly likely that Winona is a wolf. It is likely that Julius is a frog. We doubt that John moved to the garden. There is almost no chance that if 'Winona is a wolf' or 'Julius is a frog' or both then Lily is a swan. It is probably not the case that if 'Winona is a wolf and John moved to the garden' then Bernhard is a lion. It is highly unlikely that if 'Winona is a wolf' or 'John moved to the garden' or both then Greg is a swan.
It is impossible that 'Bernhard is a lion and Lily is a swan'.
It is impossible that 'Bernhard is a lion and Lily is a swan'.
Chances are about even that 'Bernhard is a lion and Lily is a swan'.

  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.
  0.7::factB.
  0.2::factC.
  %hop1
  0.02::factX:-or(factA,factB).
  0.25::factY:-and(factA,factC).
  0.05::factZ:-or(factA,factC).

  %hop2
  conclusion:-and(factY,factX).

  query(conclusion).
  
'Bernhard is a lion and Lily is a swan'.