We doubt that Julius is a lion. There is a better than even chance that John went to the hallway. It is highly likely that Lily is a frog. It is highly likely that if 'Julius is a lion' or 'John went to the hallway' or both then Brian is gray. It is unlikely that if either 'Lily is a frog' or 'John went to the hallway' but not both then Winona is a wolf. Chances are about even that if 'John went to the hallway and Lily is a frog' then Sandra got the milk.
It is probably the case that 'Winona is a wolf and Sandra got the milk'.
It is impossible that 'Winona is a wolf and Sandra got the milk'.
It is probably the case that 'Winona is a wolf and Sandra got the milk'.

  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
  0.2::factA.
  0.6::factB.
  0.9::factC.
  %hop1
  0.9::factX:-or(factA,factB).
  0.2::factY:-xor(factC,factB).
  0.5::factZ:-and(factB,factC).

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

  query(conclusion).
  
'Winona is a wolf and Sandra got the milk'.