It is probably not the case that Winona is a sheep. It is likely that Lily is a swan. It is unlikely that Julius is a lion. There is almost no chance that if either 'Lily is a swan' or 'Julius is a lion' but not both then Yann is tired. Chances are about even that if either 'Winona is a sheep' or 'Lily is a swan' but not both then Greg is a frog. It is almost certain that if either 'Julius is a lion' or 'Winona is a sheep' but not both then John dropped the apple.
It is probable that 'Greg is a frog and Lily is a swan'.
It is probably not the case that 'Greg is a frog and Lily is a swan'.
It is probable that 'Greg is a frog 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
  0.25::factA.
  0.7::factB.
  0.2::factC.
  %hop1
  0.02::factX:-xor(factB,factC).
  0.5::factY:-xor(factA,factB).
  0.95::factZ:-xor(factC,factA).

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

  query(conclusion).
  
'Greg is a frog and Lily is a swan'.